Update PipBoundsState when KCA height is set

Update PipBoundsState's NAMED_KCA_LAUNCHER_SHELF
keep clear unrestricted area, when Launcher sets
the KCA height due to shelf being visible/invisible.

Also, make sure IME visibility updates take KCA
into account if PiP hasn't been interacted with.

Bug: 356508169
Flag: com.android.wm.shell.enable_pip2_implementation
Test: swipe up to PiP, open IME, close IME
Test: swipe up to PiP, open another app, open IME, close IME
Change-Id: I3efdbf941e251334d11d7aa6e2043fa45f01f33b