Improve PIP enter transition w/ gesture nav (2/N)

Allow Launcher to query destination bounds of PiP window from SysUI.
Add also the callback notifies SysUI that the swipe-pip-to-home
operation is finished.

PipTaskOrganizer would ignore the entering transition if
swipe-pip-to-home should happen in Launcher.

Next: handle the swipe-pip-to-home transition in Launcher

Bug: 143965596
Test: N/A
Change-Id: Ia8bbdfcd4ed92c7ed968be84f0bf991feac8598e