fix(android): @volatile on paused flag for cross-thread visibility

Author: mfazekas

android/src/new/java/com/rive/RiveReactNativeView.kt

@@ -77,7 +77,7 @@ class RiveReactNativeView(context: ThemedReactContext) : FrameLayout(context) {
   private var disposed = false
   private var lastFrameTimeNs = 0L
   private var frameCount = 0L
-  private var paused = false
+  @Volatile private var paused = false
 
   private val textureView = TextureView(context).apply {
     layoutParams = LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)