Move PiP animation to SysUI package

The bounds animation is cleaned up within window manager and it's now
the SysUI component listening on callbacks from TaskOrganizer for
entering to and exiting from PiP mode.

Additionally, the expand and move of the PiP window is now part of SysUI
as well.

Known issues:
- Black background when in transition from PiP to fullscreen. The
wallpaper gets into hidden state too early
- App gets into PiP mode too early when entering PiP, need to defer the
configuration change sent to app in this case

Bug: 146594635
Bug: 148198539
Bug: 138144750
Bug: 149569903
Test: atest PinnedStackTests
Test: atest PipAnimationControllerTest
Test: atest RecentsAnimationTest
Test: atest RecentTasksTest
Test: atest com.android.server.wm.ActivityStarterTests
Change-Id: Id0c8ce03fa26952daf5e3687b18b2eb2375b7d20