Make sure that AppStateModule is subscribed to LifecycleEventListener events, and unsubscribes in onCatalystInstanceDestroy

Summary:
If modules are *not* eagerly init'd and expect lifecycle events, make sure (1) onHostResume is called immediately it it's currently active and (2) that listeners are removed in onCatalystInstanceDestroy.

Changelog: [Internal]

Reviewed By: mdvacca

Differential Revision: D26859205

fbshipit-source-id: 5398d24d2592de3fbb80ca59192b5b46543aa5c5

ReactAndroid/src/main/java/com/facebook/react/modules/appstate/AppStateModule.java

@@ -119,4 +119,14 @@ public class AppStateModule extends NativeAppStateSpec
   public void removeListeners(double count) {
     // iOS only
   }
+
+  @Override
+  public void onCatalystInstanceDestroy() {
+    super.onCatalystInstanceDestroy();
+
+    ReactApplicationContext applicationContext = getReactApplicationContextIfActiveOrWarn();
+    if (applicationContext != null) {
+      applicationContext.removeLifecycleEventListener(this);
+    }
+  }
 }