Merge changes Ifa1c51e5,I24db7165,I04d4da5a,I5656f205,I4f51148b, ... into main

* changes:
  [55/n] Integrate LetterboxTaskListenerAdapter
  [54/n] Implement ActivityLetterboxLifecycleEventFactory.
  [53/n] Define LetterboxTaskListenerAdapter
  [4/n] Create TaskAppearedListener and TaskInfoChangedListener
  [3/n] Add AppCompatTransitionInfo to ActivityTransitionInfo
  [52/n] LetterboxTaskInfoRepository implementation