Fix invalid context cast in ReactRootView (#36121)

Summary:
Hi 👋

I'm one of the  Expo contributors. When upgrading the Stripe dependency in Expo for SDK48 release on Android, we noticed the following error:
```java.lang.ClassCastException: android.view.ContextThemeWrapper cannot be cast to android.app.Activity```

With Kudo we narrowed it down to an underlying issue in the following cast in `ReactRootView` done during checking for keyboard events:
```((Activity) getContext())```

The `getContext()` is actually a `ContextThemeWrapper` for `ExperienceActivity`, so we should not cast it to an `Activity` directly - instead, we unwrap it using `getBaseContext()`.

Implementing the following fix into the Expo fork fixed the crash for us:
expo@0e2c9ca

## Changelog

[ANDROID] [FIXED] - Fixed crash occurring in certain native views when handling keyboard events.

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Pull Request resolved: #36121

Test Plan:
Tested manually by comparing two builds before and after this change. The main branch build crashes when the [Stripe 0.23.1](https://github.com/stripe/stripe-react-native) Card Element from the example app is mounted on screen. Applying the change fixed the issue.

Happy to make a more isolated reproduction if necessary.

 ---
Full stack trace:
```
         AndroidRuntime  D  Shutting down VM
                         E  FATAL EXCEPTION: main
                         E  Process: host.exp.exponent, PID: 8849
                         E  java.lang.ClassCastException: android.view.ContextThemeWrapper cannot be cast to android.app.Activity
                         E      at com.facebook.react.ReactRootView$CustomGlobalLayoutListener.checkForKeyboardEvents(ReactRootView.java:937)
                         E      at com.facebook.react.ReactRootView$CustomGlobalLayoutListener.onGlobalLayout(ReactRootView.java:913)
                         E      at android.view.ViewTreeObserver.dispatchOnGlobalLayout(ViewTreeObserver.java:1061)
                         E      at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:3352)
                         E      at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:2286)
                         E      at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8948)
                         E      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1231)
                         E      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1239)
                         E      at android.view.Choreographer.doCallbacks(Choreographer.java:899)
                         E      at android.view.Choreographer.doFrame(Choreographer.java:832)
                         E      at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1214)
                         E      at android.os.Handler.handleCallback(Handler.java:942)
                         E      at android.os.Handler.dispatchMessage(Handler.java:99)
                         E      at android.os.Looper.loopOnce(Looper.java:201)
                         E      at android.os.Looper.loop(Looper.java:288)
                         E      at android.app.ActivityThread.main(ActivityThread.java:7898)
                         E      at java.lang.reflect.Method.invoke(Native Method)
                         E      at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
                         E      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
```

Reviewed By: cortinico

Differential Revision: D43186530

Pulled By: javache

fbshipit-source-id: 2143495f6b0c71f342eba6d5abb2bfa4a529fbdd

ReactAndroid/src/main/java/com/facebook/react/ReactRootView.java

@@ -14,6 +14,7 @@
 
 import android.app.Activity;
 import android.content.Context;
+import android.content.ContextWrapper;
 import android.graphics.Canvas;
 import android.graphics.Insets;
 import android.graphics.Point;
@@ -918,6 +919,14 @@ public void onGlobalLayout() {
       checkForDeviceDimensionsChanges();
     }
 
+    private Activity getActivity() {
+      Context context = getContext();
+      while (!(context instanceof Activity) && context instanceof ContextWrapper) {
+        context = ((ContextWrapper) context).getBaseContext();
+      }
+      return (Activity) context;
+    }
+
     @RequiresApi(api = Build.VERSION_CODES.R)
     private void checkForKeyboardEvents() {
       getRootView().getWindowVisibleDisplayFrame(mVisibleViewArea);
@@ -935,7 +944,7 @@ private void checkForKeyboardEvents() {
           Insets barInsets = rootInsets.getInsets(WindowInsets.Type.systemBars());
           int height = imeInsets.bottom - barInsets.bottom;
 
-          int softInputMode = ((Activity) getContext()).getWindow().getAttributes().softInputMode;
+          int softInputMode = getActivity().getWindow().getAttributes().softInputMode;
           int screenY =
               softInputMode == WindowManager.LayoutParams.SOFT_INPUT_ADJUST_NOTHING
                   ? mVisibleViewArea.bottom - height