Implementation of DataSubscriber for cases where the client wants access to a bitmap reference.

Sample usage:

 dataSource.subscribe( new BaseBitmapReferenceDataSubscriber() { {@literal @}Override public void onNewResultImpl(@Nullable CloseableReferencebitmapReference) {
      // Pass bitmap to another component, which clones the bitmap reference if it needs to
      // hold on to the bitmap.
      doSomething(bitmapReference);
      // No need to do any cleanup.
    }

    Override
    public void onFailureImpl(DataSource dataSource) {
      // No cleanup required here.
    }
  });