Add support to listen the proposed rotation from window manager

This exposes window-based rotation. The event is generally from
WindowOrientationListener, which may use a more explicit and
accurate TYPE_DEVICE_ORIENTATION sensor (currently non-public)
if available. It can also consider other non-sensor information
(depending on the implementation of external rotation resolver)
to provide a proper rotation. So the event from it will be more
reliable. Also it is easier to use because the reported value
will be a specific rotation instead of raw degrees.

Some use cases of android.view.OrientationEventListener can
change to use this new listener if the purpose is to monitor
specific rotation.

Bug: 251440125
Test: atest WindowManagerTests#testProposedRotationListener

Change-Id: Ia9fc52e9d22bedea4be4b8962b90d03c5b342e95