Clean up even more API

Author: lauzadis

runtime/protocol/http-client-engines/http-client-engine-okhttp/api/http-client-engine-okhttp.api

@@ -87,7 +87,8 @@ public final class aws/smithy/kotlin/runtime/http/engine/okhttp/OkHttpEngineConf
 }
 
 public final class aws/smithy/kotlin/runtime/http/engine/okhttp/OkHttpEngineKt {
-	public static final fun buildClient (Laws/smithy/kotlin/runtime/http/engine/okhttp/OkHttpEngineConfig;Laws/smithy/kotlin/runtime/http/engine/internal/HttpClientMetrics;)Lokhttp3/OkHttpClient;
+	public static final fun buildClient (Laws/smithy/kotlin/runtime/http/engine/okhttp/OkHttpEngineConfig;Laws/smithy/kotlin/runtime/http/engine/internal/HttpClientMetrics;Lokhttp3/ConnectionPool;)Lokhttp3/OkHttpClient;
+	public static synthetic fun buildClient$default (Laws/smithy/kotlin/runtime/http/engine/okhttp/OkHttpEngineConfig;Laws/smithy/kotlin/runtime/http/engine/internal/HttpClientMetrics;Lokhttp3/ConnectionPool;ILjava/lang/Object;)Lokhttp3/OkHttpClient;
 }
 
 public final class aws/smithy/kotlin/runtime/http/engine/okhttp/OkHttpHeadersAdapter : aws/smithy/kotlin/runtime/http/Headers {

runtime/protocol/http-client-engines/http-client-engine-okhttp/jvm/src/aws/smithy/kotlin/runtime/http/engine/okhttp/OkHttpEngine.kt

@@ -78,7 +78,11 @@ public class OkHttpEngine(
     }
 }
 
-private fun OkHttpEngineConfig.buildClientFromConfig(
+/**
+ * Convert SDK version of HTTP configuration to OkHttp specific configuration and return the configured client
+ */
+@InternalApi
+public fun OkHttpEngineConfig.buildClient(
     metrics: HttpClientMetrics,
     poolOverride: ConnectionPool? = null,
 ): OkHttpClient {
@@ -152,16 +156,6 @@ private fun OkHttpEngineConfig.buildClientFromConfig(
     }.build()
 }
 
-/**
- * Convert SDK version of HTTP configuration to OkHttp specific configuration and return the configured client
- */
-// Used by OkHttp4Engine - OkHttp4 does NOT have `connectionListener`
-// TODO - Refactor in next minor version - Move this to OkHttp4Engine and make it private
-@InternalApi
-public fun OkHttpEngineConfig.buildClient(
-    metrics: HttpClientMetrics,
-): OkHttpClient = this.buildClientFromConfig(metrics)
-
 private fun minTlsConnectionSpec(tlsContext: TlsContext): ConnectionSpec {
     val minVersion = tlsContext.minVersion ?: TlsVersion.TLS_1_2
     val okHttpTlsVersions = SdkTlsVersion