compute correct Keyboard Height with Notch

Without Notch
- DisplayMetricsHolder.getWindowDisplayMetrics().heightPixels is 1794
- mVisibleViewArea.bottom is 1794

**With Notch**
- DisplayMetricsHolder.getWindowDisplayMetrics().heightPixels is 1668
- mVisibleViewArea.bottom is 1794

Observations:
- getWindowVisibleDisplayFrame().heightPixels returns correct height for devices with Notch
- mVisibleViewArea.bottom does not take in consideration the notch (the
  value does not change)

Solution:
- Including the Notch Height in the Keyboard Height calculation

Clear Explanation at facebook#27089 (comment)

https://github.com/facebook/react-native/blob/d79212120b7168015d3d0225ef372ed851a230fa/ReactAndroid/src/main/java/com/facebook/react/ReactRootView.java#L757-L758

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

@@ -25,6 +25,7 @@
 import android.view.ViewGroup;
 import android.view.ViewTreeObserver;
 import android.view.WindowManager;
+import android.view.DisplayCutout;
 import android.widget.FrameLayout;
 import androidx.annotation.Nullable;
 import com.facebook.common.logging.FLog;
@@ -766,8 +767,10 @@ public void onGlobalLayout() {
 
     private void checkForKeyboardEvents() {
       getRootView().getWindowVisibleDisplayFrame(mVisibleViewArea);
+      DisplayCutout displayCutout = getRootView().getRootWindowInsets().getDisplayCutout();
+      int notchHeight = displayCutout == null ? 0 : displayCutout.getSafeInsetTop();
       final int heightDiff =
-          DisplayMetricsHolder.getWindowDisplayMetrics().heightPixels - mVisibleViewArea.bottom;
+          DisplayMetricsHolder.getWindowDisplayMetrics().heightPixels - mVisibleViewArea.bottom + notchHeight;
 
       boolean isKeyboardShowingOrKeyboardHeightChanged =
           mKeyboardHeight != heightDiff && heightDiff > mMinKeyboardHeightDetected;