v9.0.0

1. Removed WorkManager and used AlarmManager. This due to in many Android devices WorkManager does not seems be working as expected.
2. Added Clear and ClearAll methods to remove notifications that you no longer want displayed in Notification Center.
3. Added Android support for Getting Pending and Delivered Notifications id list.
4. Reduced Xamarin.AndroidX.Core nuget dependency version to 1.3.2.3 to support Xamarin.Forms nuget release v. 5.0.0.2083

Fixed

1. Fixed BroadcastReceiver name issue when running on android 7 and below

Thank you
@GudniNatan #200
@mphill #187
@GitBOUF #198