Reduce visibility of FrescoBasedReactTextInlineImageSpan

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 FrescoBasedReactTextInlineImageSpan

Reviewed By: arushikesarwani94

Differential Revision: D49803287

fbshipit-source-id: 1b00fbcf5f61af96fe7a182d40b985b7ce71a872

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/text/frescosupport/FrescoBasedReactTextInlineImageSpan.java

@@ -40,7 +40,7 @@
  * <p>Note: It borrows code from DynamicDrawableSpan and if that code updates how it computes size
  * or draws, we need to update this as well.
  */
-public class FrescoBasedReactTextInlineImageSpan extends TextInlineImageSpan {
+class FrescoBasedReactTextInlineImageSpan extends TextInlineImageSpan {
 
   private @Nullable Drawable mDrawable;
   private final AbstractDraweeControllerBuilder mDraweeControllerBuilder;