Add API to indicate supported windowing modes on the virtual displays

1. Add new API in DWPC to get windowing features of the virtual display.
2. In ActivityRecord, consume the value of the allowed windowing modes
   of virtual display.

Bug: 180435098
Test: atest WmTests:ActivityRecordTests#testSupportsPictureInPicture && atest WmTests:DisplayWindowPolicyControllerHelperTests

Change-Id: I39a6cd9417f266f7fdef72cc054263c3ca4c5650