Stub ReadWriteSplittingPlugin (#76)

### Description

Stub ReadWriteSplittingPlugin

### By submitting this pull request, I confirm that my contribution is
made under the terms of the Apache 2.0 license.

Author: justing-bq

aws_wrapper/plugin_service.py

@@ -49,6 +49,8 @@
 from aws_wrapper.hostinfo import HostAvailability, HostInfo, HostRole
 from aws_wrapper.iam_plugin import IamAuthPluginFactory
 from aws_wrapper.plugin import CanReleaseResources
+from aws_wrapper.read_write_splitting_plugin import \
+    ReadWriteSplittingPluginFactory
 from aws_wrapper.utils.cache_map import CacheMap
 from aws_wrapper.utils.messages import Messages
 from aws_wrapper.utils.notifications import (ConnectionEvent, HostEvent,
@@ -419,7 +421,8 @@ class PluginManager(CanReleaseResources):
         "aurora_connection_tracker": AuroraConnectionTrackerPluginFactory,
         "aurora_host_list": AuroraHostListPluginFactory,
         "host_monitoring": HostMonitoringPluginFactory,
-        "failover": FailoverPluginFactory
+        "failover": FailoverPluginFactory,
+        "readWriteSplitting": ReadWriteSplittingPluginFactory
     }
 
     def __init__(

aws_wrapper/read_write_splitting_plugin.py

@@ -0,0 +1,80 @@
+#  Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License").
+#  You may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#  http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from aws_wrapper.host_list_provider import HostListProviderService
+    from aws_wrapper.hostinfo import HostInfo
+    from aws_wrapper.plugin_service import PluginService
+    from aws_wrapper.utils.properties import Properties
+
+from typing import Any, Callable, Set
+
+from aws_wrapper.pep249 import Connection
+from aws_wrapper.plugin import Plugin, PluginFactory
+from aws_wrapper.utils.notifications import (ConnectionEvent,
+                                             OldConnectionSuggestedAction)
+
+
+class ReadWriteSplittingPlugin(Plugin):
+    _SUBSCRIBED_METHODS: Set[str] = {"init_host_provider",
+                                     "connect",
+                                     "notify_connection_changed",
+                                     "Connection.set_read_only",
+                                     "Connection.clear_warnings"}
+
+    def __init__(self, plugin_service: PluginService, props: Properties):
+        self._plugin_service = plugin_service
+        self._properties = props
+
+    @property
+    def subscribed_methods(self) -> Set[str]:
+        return self._SUBSCRIBED_METHODS
+
+    def init_host_provider(
+            self,
+            props: Properties,
+            host_list_provider_service: HostListProviderService,
+            init_host_provider_func: Callable):
+        ...
+
+    def connect(
+            self,
+            host_info: HostInfo,
+            props: Properties,
+            initial: bool,
+            connect_func: Callable) -> Connection:
+        return Connection()
+
+    def force_connect(
+            self,
+            host_info: HostInfo,
+            props: Properties,
+            initial: bool,
+            force_connect_func: Callable) -> Connection:
+        return Connection()
+
+    def notify_connection_changed(self, changes: Set[ConnectionEvent]) -> OldConnectionSuggestedAction:
+        return OldConnectionSuggestedAction.NO_OPINION
+
+    def execute(self, target: type, method_name: str, execute_func: Callable, *args: Any) -> Any:
+        ...
+
+
+class ReadWriteSplittingPluginFactory(PluginFactory):
+    def get_instance(self, plugin_service: PluginService, props: Properties) -> Plugin:
+        return ReadWriteSplittingPlugin(plugin_service, props)