[wm] VirtualDisplayConfig to mirror the non-default display

The application can request to mirror default display by using MediaProjection.
However, there is no way to mirror the specific display on multi-display enviroment.

Now, the application can set displayIdToMirror through VirtualDisplayConfig class.

Test: atest FrameworksServicesTests:DisplayManagerServiceTest
Bug : 127687569

Change-Id: I1ef94bfa79e103d0a4a05a10fc8705ed3bbcc0c9