Refactor one handed displayArea working flow

1) onDisplayAreaAppeared() callback N times separately
2) Cache all displayAreaInfos with a Map
3) Hook DisplayChangeController.OnDisplayChangingListener instead of
   onDisplayAreaInfoChanged() on handling rotation
4) Remove unused code in OneHandedTransitionAnimator
5) go/android-display-area-policy-builder

Bug: 157123830
Test: atest com.android.systemui.onehanded
Test: atest SystemUITests
Test: atest OneHandedDisplayAreaOrganizerTest
Change-Id: Ia73315d8ec7eaf8d8122c7830964be7cff6b836c