Implement no anim auto-enter pip 2/3

Implement no animation auto enter pip with button
navigation mode. Resolve the TransitionRequestInfo in
...pip2.PipTransition#handleRequest() and add
movePipActivityToPinnedRootTask() hierarchy op for it
to directly set the final entry pip bounds in Core.

Note that for now the bounds default to top left corner since display
layout is not being properly updated/set now - that requires
pip2.PipController to be introduced in CL 3/3. The pip is also in the
wrong state at this point since none of the other CUJs are being
handled.

Bug: 301157553
Test: mp droid

Change-Id: Ifdc9825ebf7077bbdd5807df04ebe077aa20d9e9