Indicate PiP animation type from Launcher to SysUI

Also, need callback from SysUI to Launcher once the pip animation is
started to keep back compatibility.

Bug: 146594635
Test: manually
Merged-In: I617a17fd5f6049d9f1d49f9f834623a2bb49f6ca
Change-Id: I617a17fd5f6049d9f1d49f9f834623a2bb49f6ca
(cherry picked from commit a1a91b0c)