Use requestActivityTransitionUpdates on Android

[flodaniel]

The plugin currently uses the raw activity stream on this line: https://github.com/Dev-hwang/flutter_activity_recognition/blob/fc307fae14686b4ce0470782862bcfe089a26c81/android/src/main/kotlin/com/pravera/flutter_activity_recognition/service/ActivityRecognitionManager.kt#L74C12-L74C12

In addition to the option of subscribing to the raw activity recognition stream it would be good to have the option to just subscribe to transition events:

https://developers.google.com/android/reference/com/google/android/gms/location/ActivityRecognitionClient#requestActivityTransitionUpdates(com.google.android.gms.location.ActivityTransitionRequest,%20android.app.PendingIntent)

[utkarsh1097]

Agree. This will be a very useful enhancement.