WM/SurfacePackage: Forward insets to WindowContainer overlays

We add support for forwarding InsetsState over SurfacePackage
to reach embedded ViewRootImpl. As a next step we hook up
forwarding of insets from the main visible window of a task
with overlays, to said overlays. We provide a frame so that
the remote ViewRootImpl can interpret the insets relative
to this frame. In the TaskOverlay case everything in the
remote SurfaceControlViewHost is in a world relative to the
task bounds, and so we send the task bounds. Transient insets
are also forwarded via this channel. This is due to the
specific requirements of game service overlay, but seems
to make sense in general for overlays, who will need to be able
to intelligently handle immersive mode.

Bug: 213603716
Bug: 214239892
Test: SurfaceControlWindowInsetsTest
Change-Id: I22e22050a5dec71d8120ef4fea4a1c9bc452e02f