Reduce visibility of Capture

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 Capture

Reviewed By: cortinico

Differential Revision: D49803273

fbshipit-source-id: 5c57f7865b4d2b58b3a8ffcde8c424c0a65ee7d2

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/runtime/internal/bolts/Capture.java

@@ -14,7 +14,7 @@
  *
  * @param <T>
  */
-public class Capture<T> {
+class Capture<T> {
   private @Nullable T value;
 
   public Capture() {}