Reduce visibility of DidJSUpdateUiDuringFrameDetector

Summary:
In an attempt to reduce footprint of React Native Android public APIs we are reducing visibility of classes and interfaces that are not meant to be used publicly OR are public but have no usages.
As part of our analysis, which involved looking for usages inside the Meta codebase and code search in OSS, we've detected that this class/interface is public but it's not used from other packages.

If you are using this class or interface please comment in this PR and we will restate the public access.

bypass-github-export-checks

changelog: [Android][Changed] Reducing visibility of DidJSUpdateUiDuringFrameDetector

Reviewed By: arushikesarwani94

Differential Revision: D49803285

fbshipit-source-id: e9312a7fbf86ae75bdc4b50922676ab8d1140be7

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/modules/debug/DidJSUpdateUiDuringFrameDetector.java

@@ -20,7 +20,7 @@
  * a {@link ReactBridge} and a {@link UIManagerModule}, {@link #getDidJSHitFrameAndCleanup} should
  * be called once per frame via a {@link Choreographer.FrameCallback}.
  */
-public class DidJSUpdateUiDuringFrameDetector
+class DidJSUpdateUiDuringFrameDetector
     implements NotThreadSafeBridgeIdleDebugListener, NotThreadSafeViewHierarchyUpdateDebugListener {
 
   private final LongArray mTransitionToIdleEvents = LongArray.createWithInitialCapacity(20);