Use consumer to dispatch signal between Launcher & SysUI OPS Pip(8-2/N)

Since IPinnedStackAnimationListener.aidl is not able to move shell lib
Add a proxy in OPS dispatching callback to Launcher when PIP animation
started.

Bug: 161118569
Test: make SystemUI
Test: make ArcSystemUI
Test: lunch aosp_tv_arm-userdebug & make
Test: atest WindowManagerShellTests
Test: atest SystemUITests
Test: adb shell input keyevent 171(KEYCODE_WINDOW)
Test: manual test Pip demo AP
Test: adb shell dumpsys activity service com.android.systemui
Change-Id: I750c4f773c99c8e9230d11e710e1cc3796577df2