Update media permissions for Android 13 #17715
Description
We must use READ_MEDIA_IMAGES, READ_MEDIA_VIDEO and READ_MEDIA_AUDIO instead of READ_EXTERNAL_STORAGE.
### Tasks
- [x] Also, update Loop demo app in stories-android repo https://github.com/Automattic/stories-android/pull/732
- [x] Update example app in FluxC https://github.com/wordpress-mobile/WordPress-FluxC-Android/pull/2706
- [x] Update PhotoEditor package in stories-android repo https://github.com/Automattic/stories-android/pull/732
https://developer.android.com/about/versions/13/behavior-changes-13#granular-media-permissions