[jni] Fix the context when using multiple flutter engines

[HosseinYousefi]

Blocked by flutter/flutter#173474
Also missing integration tests but I will write those when the hot restart problem gets resolved.

[github-actions]

PR Health

Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
jni	Breaking	0.14.2	0.15.0-wip	0.15.0	✔️

Changelog Entry ✔️

Package	Changed Files

Changes to files need to be accounted for in their respective changelogs.

API leaks ⚠️

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

Package	Leaked API symbol	Leaking sources
jni	JObjType	jarray.dart::JArrayNullableType types.dart::JObjType::superType types.dart::JObjType::nullableType jobject.dart::JObject::type jobject.dart::JObject::nullableType jobject.dart::JObject::isA::type jobject.dart::JObject::as::type jarray.dart::JArray::type::innerType jarray.dart::JArrayType jarray.dart::JArrayType::superType jarray.dart::JArrayType::nullableType jarray.dart::JArray::nullableType::innerType jarray.dart::JArray::filled::E jarray.dart::JArray::of::elementType jarray.dart::JArray::fromReference::elementType jarray.dart::JArray::new::elementType jarray.dart::JArrayNullableType::superType jarray.dart::JArrayNullableType::nullableType jarray.dart::JBooleanArrayNullableType jarray.dart::JBooleanArrayNullableType::superType jarray.dart::JBooleanArrayNullableType::nullableType jarray.dart::JBooleanArrayType jarray.dart::JBooleanArrayType::superType jarray.dart::JBooleanArrayType::nullableType jarray.dart::JByteArrayNullableType jarray.dart::JByteArrayNullableType::superType jarray.dart::JByteArrayNullableType::nullableType jarray.dart::JByteArrayType jarray.dart::JByteArrayType::superType jarray.dart::JByteArrayType::nullableType jarray.dart::JCharArrayNullableType jarray.dart::JCharArrayNullableType::superType jarray.dart::JCharArrayNullableType::nullableType jarray.dart::JCharArrayType jarray.dart::JCharArrayType::superType jarray.dart::JCharArrayType::nullableType jarray.dart::JShortArrayNullableType jarray.dart::JShortArrayNullableType::superType jarray.dart::JShortArrayNullableType::nullableType jarray.dart::JShortArrayType jarray.dart::JShortArrayType::superType jarray.dart::JShortArrayType::nullableType jarray.dart::JIntArrayNullableType jarray.dart::JIntArrayNullableType::superType jarray.dart::JIntArrayNullableType::nullableType jarray.dart::JIntArrayType jarray.dart::JIntArrayType::superType jarray.dart::JIntArrayType::nullableType jarray.dart::JLongArrayNullableType jarray.dart::JLongArrayNullableType::superType jarray.dart::JLongArrayNullableType::nullableType jarray.dart::JLongArrayType jarray.dart::JLongArrayType::superType jarray.dart::JLongArrayType::nullableType jarray.dart::JFloatArrayNullableType jarray.dart::JFloatArrayNullableType::superType jarray.dart::JFloatArrayNullableType::nullableType jarray.dart::JFloatArrayType jarray.dart::JFloatArrayType::superType jarray.dart::JFloatArrayType::nullableType jarray.dart::JDoubleArrayNullableType jarray.dart::JDoubleArrayNullableType::superType jarray.dart::JDoubleArrayNullableType::nullableType jarray.dart::JDoubleArrayType jarray.dart::JDoubleArrayType::superType jarray.dart::JDoubleArrayType::nullableType jimplementer.dart::JImplementer::implement::type jobject.dart::JObjectNullableType jobject.dart::JObjectNullableType::superType jobject.dart::JObjectNullableType::nullableType jobject.dart::JObjectType jobject.dart::JObjectType::superType jobject.dart::JObjectType::nullableType lang/jboolean.dart::JBooleanNullableType lang/jboolean.dart::JBooleanType lang/jboolean.dart::JBooleanType::superType lang/jboolean.dart::JBooleanType::nullableType lang/jboolean.dart::JBooleanNullableType::superType lang/jboolean.dart::JBooleanNullableType::nullableType lang/jbyte.dart::JByteNullableType lang/jnumber.dart::JNumberType lang/jnumber.dart::JNumberType::superType lang/jnumber.dart::JNumberType::nullableType lang/jnumber.dart::JNumberNullableType lang/jnumber.dart::JNumberNullableType::superType lang/jnumber.dart::JNumberNullableType::nullableType lang/jbyte.dart::JByteType lang/jbyte.dart::JByteType::superType lang/jbyte.dart::JByteType::nullableType lang/jbyte.dart::JByteNullableType::superType lang/jbyte.dart::JByteNullableType::nullableType lang/jcharacter.dart::JCharacterNullableType lang/jcharacter.dart::JCharacterType lang/jcharacter.dart::JCharacterType::superType lang/jcharacter.dart::JCharacterType::nullableType lang/jcharacter.dart::JCharacterNullableType::superType lang/jcharacter.dart::JCharacterNullableType::nullableType lang/jdouble.dart::JDoubleNullableType lang/jdouble.dart::JDoubleType lang/jdouble.dart::JDoubleType::superType lang/jdouble.dart::JDoubleType::nullableType lang/jdouble.dart::JDoubleNullableType::superType lang/jdouble.dart::JDoubleNullableType::nullableType lang/jfloat.dart::JFloatNullableType lang/jfloat.dart::JFloatType lang/jfloat.dart::JFloatType::superType lang/jfloat.dart::JFloatType::nullableType lang/jfloat.dart::JFloatNullableType::superType lang/jfloat.dart::JFloatNullableType::nullableType lang/jinteger.dart::JIntegerNullableType lang/jinteger.dart::JIntegerType lang/jinteger.dart::JIntegerType::superType lang/jinteger.dart::JIntegerType::nullableType lang/jinteger.dart::JIntegerNullableType::superType lang/jinteger.dart::JIntegerNullableType::nullableType lang/jlong.dart::JLongNullableType lang/jlong.dart::JLongType lang/jlong.dart::JLongType::superType lang/jlong.dart::JLongType::nullableType lang/jlong.dart::JLongNullableType::superType lang/jlong.dart::JLongNullableType::nullableType lang/jshort.dart::JShortType lang/jshort.dart::JShortType::superType lang/jshort.dart::JShortType::nullableType lang/jshort.dart::JShortNullableType lang/jshort.dart::JShortNullableType::superType lang/jshort.dart::JShortNullableType::nullableType lang/jstring.dart::JStringNullableType lang/jstring.dart::JString::type lang/jstring.dart::JString::nullableType lang/jstring.dart::JStringNullableType::superType lang/jstring.dart::JStringNullableType::nullableType lang/jstring.dart::JStringType lang/jstring.dart::JStringType::superType lang/jstring.dart::JStringType::nullableType nio/jbuffer.dart::JBufferNullableType nio/jbuffer.dart::JBufferType nio/jbuffer.dart::JBufferType::superType nio/jbuffer.dart::JBufferType::nullableType nio/jbuffer.dart::JBufferNullableType::superType nio/jbuffer.dart::JBufferNullableType::nullableType nio/jbyte_buffer.dart::JByteBufferNullableType nio/jbyte_buffer.dart::JByteBufferType nio/jbyte_buffer.dart::JByteBufferType::superType nio/jbyte_buffer.dart::JByteBufferType::nullableType nio/jbyte_buffer.dart::JByteBufferNullableType::superType nio/jbyte_buffer.dart::JByteBufferNullableType::nullableType util/jiterator.dart::JIteratorNullableType util/jiterator.dart::JIterator::type::E util/jiterator.dart::JIteratorType util/jiterator.dart::JIteratorType::superType util/jiterator.dart::JIteratorType::nullableType util/jiterator.dart::JIterator::nullableType::E util/jiterator.dart::JIterator::fromReference::E util/jiterator.dart::JIteratorNullableType::superType util/jiterator.dart::JIteratorNullableType::nullableType util/jlist.dart::JListNullableType util/jlist.dart::JList::type::E util/jlist.dart::JListType util/jlist.dart::JListType::superType util/jlist.dart::JListType::nullableType util/jlist.dart::JList::nullableType::E util/jlist.dart::JList::fromReference::E util/jlist.dart::JList::array::E util/jlist.dart::JListNullableType::superType util/jlist.dart::JListNullableType::nullableType util/jlist.dart::ToJavaList::toJList::type util/jmap.dart::JMapNullableType util/jset.dart::JSet::type::E util/jset.dart::JSetType util/jset.dart::JSetType::superType util/jset.dart::JSetType::nullableType util/jset.dart::JSet::nullableType::E util/jset.dart::JSetNullableType util/jset.dart::JSetNullableType::superType util/jset.dart::JSetNullableType::nullableType util/jset.dart::JSet::fromReference::E util/jset.dart::JSet::hash::E util/jmap.dart::JMap::type::K util/jmap.dart::JMap::type::V util/jmap.dart::JMapType util/jmap.dart::JMapType::superType util/jmap.dart::JMapType::nullableType util/jmap.dart::JMap::nullableType::K util/jmap.dart::JMap::nullableType::V util/jmap.dart::JMap::fromReference::K util/jmap.dart::JMap::fromReference::V util/jmap.dart::JMap::hash::K util/jmap.dart::JMap::hash::V util/jmap.dart::JMapNullableType::superType util/jmap.dart::JMapNullableType::nullableType util/jmap.dart::ToJavaMap::toJMap::keyType util/jmap.dart::ToJavaMap::toJMap::valueType util/jset.dart::ToJavaSet::toJSet::type
jni	JCallable	types.dart::JObjType types.dart::JInstanceMethodId::call::returnType types.dart::JStaticMethodId::call::returnType jarray.dart::JArrayType jarray.dart::JArrayNullableType jarray.dart::JBooleanArrayNullableType jarray.dart::JBooleanArrayType jarray.dart::JByteArrayNullableType jarray.dart::JByteArrayType jarray.dart::JCharArrayNullableType jarray.dart::JCharArrayType jarray.dart::JShortArrayNullableType jarray.dart::JShortArrayType jarray.dart::JIntArrayNullableType jarray.dart::JIntArrayType jarray.dart::JLongArrayNullableType jarray.dart::JLongArrayType jarray.dart::JFloatArrayNullableType jarray.dart::JFloatArrayType jarray.dart::JDoubleArrayNullableType jarray.dart::JDoubleArrayType jobject.dart::JObjectNullableType jobject.dart::JObjectType types.dart::jbyteType types.dart::jbooleanType types.dart::jcharType types.dart::jshortType types.dart::jintType types.dart::jlongType types.dart::jfloatType types.dart::jdoubleType types.dart::jvoidType lang/jboolean.dart::JBooleanType lang/jboolean.dart::JBooleanNullableType lang/jnumber.dart::JNumberType lang/jnumber.dart::JNumberNullableType lang/jbyte.dart::JByteType lang/jbyte.dart::JByteNullableType lang/jcharacter.dart::JCharacterType lang/jcharacter.dart::JCharacterNullableType lang/jdouble.dart::JDoubleType lang/jdouble.dart::JDoubleNullableType lang/jfloat.dart::JFloatType lang/jfloat.dart::JFloatNullableType lang/jinteger.dart::JIntegerType lang/jinteger.dart::JIntegerNullableType lang/jlong.dart::JLongType lang/jlong.dart::JLongNullableType lang/jshort.dart::JShortType lang/jshort.dart::JShortNullableType lang/jstring.dart::JStringNullableType lang/jstring.dart::JStringType nio/jbuffer.dart::JBufferType nio/jbuffer.dart::JBufferNullableType nio/jbyte_buffer.dart::JByteBufferType nio/jbyte_buffer.dart::JByteBufferNullableType util/jiterator.dart::JIteratorType util/jiterator.dart::JIteratorNullableType util/jlist.dart::JListType util/jlist.dart::JListNullableType util/jset.dart::JSetType util/jset.dart::JSetNullableType util/jmap.dart::JMapType util/jmap.dart::JMapNullableType
jni	JConstructable	types.dart::JObjType types.dart::JConstructorId::call::returnType jarray.dart::JArrayType jarray.dart::JArrayNullableType jarray.dart::JBooleanArrayNullableType jarray.dart::JBooleanArrayType jarray.dart::JByteArrayNullableType jarray.dart::JByteArrayType jarray.dart::JCharArrayNullableType jarray.dart::JCharArrayType jarray.dart::JShortArrayNullableType jarray.dart::JShortArrayType jarray.dart::JIntArrayNullableType jarray.dart::JIntArrayType jarray.dart::JLongArrayNullableType jarray.dart::JLongArrayType jarray.dart::JFloatArrayNullableType jarray.dart::JFloatArrayType jarray.dart::JDoubleArrayNullableType jarray.dart::JDoubleArrayType jobject.dart::JObjectNullableType jobject.dart::JObjectType lang/jboolean.dart::JBooleanType lang/jboolean.dart::JBooleanNullableType lang/jnumber.dart::JNumberType lang/jnumber.dart::JNumberNullableType lang/jbyte.dart::JByteType lang/jbyte.dart::JByteNullableType lang/jcharacter.dart::JCharacterType lang/jcharacter.dart::JCharacterNullableType lang/jdouble.dart::JDoubleType lang/jdouble.dart::JDoubleNullableType lang/jfloat.dart::JFloatType lang/jfloat.dart::JFloatNullableType lang/jinteger.dart::JIntegerType lang/jinteger.dart::JIntegerNullableType lang/jlong.dart::JLongType lang/jlong.dart::JLongNullableType lang/jshort.dart::JShortType lang/jshort.dart::JShortNullableType lang/jstring.dart::JStringNullableType lang/jstring.dart::JStringType nio/jbuffer.dart::JBufferType nio/jbuffer.dart::JBufferNullableType nio/jbyte_buffer.dart::JByteBufferType nio/jbyte_buffer.dart::JByteBufferNullableType util/jiterator.dart::JIteratorType util/jiterator.dart::JIteratorNullableType util/jlist.dart::JListType util/jlist.dart::JListNullableType util/jset.dart::JSetType util/jset.dart::JSetNullableType util/jmap.dart::JMapType util/jmap.dart::JMapNullableType
jni	JAccessible	types.dart::JObjType types.dart::JInstanceFieldId::get::type types.dart::JInstanceFieldId::set::type types.dart::JStaticFieldId::get::type types.dart::JStaticFieldId::set::type jarray.dart::JArrayType jarray.dart::JArrayNullableType jarray.dart::JBooleanArrayNullableType jarray.dart::JBooleanArrayType jarray.dart::JByteArrayNullableType jarray.dart::JByteArrayType jarray.dart::JCharArrayNullableType jarray.dart::JCharArrayType jarray.dart::JShortArrayNullableType jarray.dart::JShortArrayType jarray.dart::JIntArrayNullableType jarray.dart::JIntArrayType jarray.dart::JLongArrayNullableType jarray.dart::JLongArrayType jarray.dart::JFloatArrayNullableType jarray.dart::JFloatArrayType jarray.dart::JDoubleArrayNullableType jarray.dart::JDoubleArrayType jobject.dart::JObjectNullableType jobject.dart::JObjectType types.dart::jbyteType types.dart::jbooleanType types.dart::jcharType types.dart::jshortType types.dart::jintType types.dart::jlongType types.dart::jfloatType types.dart::jdoubleType lang/jboolean.dart::JBooleanType lang/jboolean.dart::JBooleanNullableType lang/jnumber.dart::JNumberType lang/jnumber.dart::JNumberNullableType lang/jbyte.dart::JByteType lang/jbyte.dart::JByteNullableType lang/jcharacter.dart::JCharacterType lang/jcharacter.dart::JCharacterNullableType lang/jdouble.dart::JDoubleType lang/jdouble.dart::JDoubleNullableType lang/jfloat.dart::JFloatType lang/jfloat.dart::JFloatNullableType lang/jinteger.dart::JIntegerType lang/jinteger.dart::JIntegerNullableType lang/jlong.dart::JLongType lang/jlong.dart::JLongNullableType lang/jshort.dart::JShortType lang/jshort.dart::JShortNullableType lang/jstring.dart::JStringNullableType lang/jstring.dart::JStringType nio/jbuffer.dart::JBufferType nio/jbuffer.dart::JBufferNullableType nio/jbyte_buffer.dart::JByteBufferType nio/jbyte_buffer.dart::JByteBufferNullableType util/jiterator.dart::JIteratorType util/jiterator.dart::JIteratorNullableType util/jlist.dart::JListType util/jlist.dart::JListNullableType util/jset.dart::JSetType util/jset.dart::JSetNullableType util/jmap.dart::JMapType util/jmap.dart::JMapNullableType
jni	_JFinalizable	jreference.dart::JReference::new::_finalizable
jni	_Dart_FinalizableHandle	third_party/jni_bindings_generated.dart::JniBindings::newJObjectFinalizableHandle third_party/jni_bindings_generated.dart::JniBindings::newBooleanFinalizableHandle third_party/jni_bindings_generated.dart::JniBindings::deleteFinalizableHandle::finalizableHandle third_party/jni_bindings_generated.dart::Dart_FinalizableHandle

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Files
pkgs/jni/lib/src/third_party/generated_bindings.dart
pkgs/native_doc_dartifier/lib/native_doc_dartifier.dart
pkgs/native_doc_dartifier/lib/src/native_doc_dartifier_base.dart
pkgs/native_doc_dartifier/tool/compile_java.dart
pkgs/objective_c/lib/src/ns_input_stream.dart