VDM interactive screen mirroring

- Allow VDM to create auto mirror virtual displays:
It would be up to the caller to pass the appropriate
flags to VirtualDevice#createVirtualDisplay to create
an auto-mirror virtual display, following the exact
semantics as DisplayManager#createVirtualDisplay, i.e.,
either pass VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR explicitly
or pass VIRTUAL_DISPLAY_FLAG_PUBLIC, without
VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY in either case.

- VDM supports mirroring only the default display, and
any mirror display is put into the default display group.

- Launching presentations or activities are not allowed
on any mirror display created by a virtual device.

- VIRTUAL_DISPLAY_ALWAYS_UNLOCKED flag is not set for
any mirror display.

Test: atest DisplayManagerServiceTest, VirtualDeviceManagerServiceTest
Bug: 292212199
Change-Id: I3f65f1f19bd44aba278531308822c05da956f700