Create ReactFeatureFlag to initialize MapBufferSo file during Fabric initialization

Summary:
This diff creates a ReactFeatureFlag to initialize MapBufferSo file during Fabric initialization.

This is necessary to be able to compare properly Mapbuffer vs ReadableNativeMap (because ReadableNativeMap c++ files is already included in the bridge so file)

changelog: [internal]

Reviewed By: JoshuaGross

Differential Revision: D28436044

fbshipit-source-id: 338e1bb72b5313dc29a309e1b0e979e7c8bd1c18

ReactAndroid/src/main/java/com/facebook/react/fabric/FabricJSIModuleProvider.java

@@ -15,6 +15,8 @@ import com.facebook.react.bridge.JSIModuleProvider;
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.bridge.UIManager;
 import com.facebook.react.bridge.queue.MessageQueueThread;
+import com.facebook.react.common.mapbuffer.ReadableMapBuffer;
+import com.facebook.react.common.mapbuffer.ReadableMapBufferSoLoader;
 import com.facebook.react.config.ReactFeatureFlags;
 import com.facebook.react.fabric.events.EventBeatManager;
 import com.facebook.react.fabric.events.EventEmitterWrapper;
@@ -67,6 +69,9 @@ public class FabricJSIModuleProvider implements JSIModuleProvider<UIManager> {
     if (ReactFeatureFlags.eagerInitializeFabricClasses) {
       loadClasses();
     }
+    if (ReactFeatureFlags.enableEagerInitializeMapBufferSoFile) {
+      ReadableMapBufferSoLoader.staticInit();
+    }
     MessageQueueThread jsMessageQueueThread =
         mReactApplicationContext
             .getCatalystInstance()
@@ -138,5 +143,6 @@ public class FabricJSIModuleProvider implements JSIModuleProvider<UIManager> {
     SurfaceHandlerBinding.class.getClass();
     BatchEventDispatchedListener.class.getClass();
     ReactNativeConfig.class.getClass();
+    ReadableMapBuffer.class.getClass();
   }
 }