• [Android] added the ability to create notification channels before a notification is shown. This can be done by calling the createNotificationChannel within the AndroidFlutterLocalNotificationsPlugin class. This allows applications to create notification channels before a notification is shown. Thanks to the PR from Vladimir Gerashchenko.
• [Android] added the ability to delete notification channels. This can be done by calling deleteNotificationChannel within AndroidFlutterLocalNotificationsPlugin class.