[PiP2] Handle enter PiP and display change in sync

Sometimes enter PiP transition can also collect the display change
which would not be hitting the traditional fixed-rotation case.
This happens when TRANSIT_PIP is collecting and display change is also
happening in Core, in which case a separate IDisplayChangeWindowControllerImpl
channel is used to dispatch onDisplayChange callbacks.

This means these onDisplayChange() callbacks can come in after
startWCT was sent to Core, but before we start animating the transition.
So what we can do is recognize this and update the Shell-side PiP bounds
state as needed, fake animate PiP in the desired destination bounds when
the transition arrives to be played, and then kick off a jumpcut bounds
change transition to restore the WM bounds as well.

This happens 100% of the time when entering PiP by tapping elsewhere in
overview from landscape with the resumed activity supporting auto-enter PiP.

Bug: 381186732
Flag: com.android.wm.shell.enable_pip2
Test: tap elsewhere in Overview with PiP-able activity resumed in
landscape

Change-Id: Idc9e9b6d2783e5ab1887a5b436682054851d46ea