Merge "Add PipTransitionState into pip2" into main

...Shell/src/com/android/wm/shell/dagger/pip/Pip2Module.java

...src/com/android/wm/shell/pip/PipTransitionController.java

...ll/src/com/android/wm/shell/pip2/phone/PipController.java

...ell/src/com/android/wm/shell/pip2/phone/PipScheduler.java

...ll/src/com/android/wm/shell/pip2/phone/PipTransition.java

...c/com/android/wm/shell/pip2/phone/PipTransitionState.java

...src/com/android/wm/shell/pip2/PipTransitionStateTest.java