Queue the event for preallocated but not mounted view to dispatch later

Summary:
This diff fixed an edge case that event dispatching is failed after pre-allocation of a view and before the view is mounted.

When a cached image is loaded, we will dispatch the event to JS immediately. This is could happen after the view is created during pre-allocation phase, when the event emitter is not instantiated yet. In that case, we will see [an error](https://github.com/facebook/react-native/blob/main/ReactAndroid/src/main/java/com/facebook/react/fabric/FabricUIManager.java#L927) and the event will effectively be ignored.

To fix that we introduced a queue in this diff for those events. They will be dispatched in order when the view is mounted and the event emitter is non-null.

Changelog:
[Android][Fixed] - Fixed an edge case that event dispatching is failed after pre-allocation of a view and before the view is mounted.

Reviewed By: mullender

Differential Revision: D36331914

fbshipit-source-id: cd065b0b36978cb5f0aac793d8d16f07a48f0881

ReactAndroid/src/main/java/com/facebook/react/config/ReactFeatureFlags.java

@@ -111,6 +111,9 @@ public class ReactFeatureFlags {
 
   public static boolean dispatchPointerEvents = false;
 
+  /** Feature Flag to enable the pending event queue in fabric before mounting views */
+  public static boolean enableFabricPendingEventQueue = false;
+
   /** Feature Flag to control RN Android scrollEventThrottle prop. */
   public static boolean enableScrollEventThrottle = false;
 }