Show edge glowing on keyboard connect

Scenarios:
- on keyboard connect, play the animation with a fixed duration
- while playing the animation keyborad disconnects, finish animation
  with ease out
- when config changes, force cancel animation and nullify animation
  config.

Bug: 324600132
Test: KeyboardDockingIndicationViewModelTest
Test: Replace KeyboardRepositoryImpl with CommandLineKeyboardRepository
and run adb shell cmd statusbar keyboard keyboard-connected true|false
Flag: com.android.systemui.keyboard_docking_indicator
Change-Id: Ia7130bf10aba98dcb33d983501332dd1848796ee

Change-Id: I6fd359c989368159d9b5056c00190de916346ae6