Status bar updates causes ui freeze on some devices (#7231)

Modify flags for DecorView in the global main thread handler caused ui to freeze when calling `mergeOptions` inside useEffect.
This happens on Samsung devices with Android 9, that seems it has issues internally since it is not reproduce on emulator and other devices including Samsungs with new android versions.

The workaround was to set the flags in a task to run in the DecorView MessageQueue in order to ensure flags are set when the DecorView is ready internally to accept changes.

Co-authored-by: Yogev Ben David <yogev132@gmail.com>

Author: swabbass

lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/viewcontroller/Presenter.java

@@ -136,15 +136,18 @@ private void setTextColorScheme(StatusBarOptions statusBar) {
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) return;
 
         final View view = activity.getWindow().getDecorView();
+        //View.post is a Workaround, added to solve internal Samsung 
+        //Android 9 issues. For more info see https://github.com/wix/react-native-navigation/pull/7231
+        view.post(()->{
+            int flags = view.getSystemUiVisibility();
+            if (isDarkTextColorScheme(statusBar)) {
+                flags |= View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR;
+            } else {
+                flags &= ~View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR;
+            }
 
-        int flags = view.getSystemUiVisibility();
-        if (isDarkTextColorScheme(statusBar)) {
-            flags |= View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR;
-        } else {
-            flags &= ~View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR;
-        }
-        
-        view.setSystemUiVisibility(flags);
+            view.setSystemUiVisibility(flags);
+        });
     }
 
     private void mergeStatusBarOptions(View view, StatusBarOptions statusBar) {