libs: wayland: implement video overlay API

libs: wayland: implement video overlay API

The Wayland sub-surfaces API is used to embed the video into an application
window.

See Appendix A. Wayland Protocol Specification as the following.

"""
The aim of sub-surfaces is to offload some of the compositing work
within a window from clients to the compositor. A prime example is
a video player with decorations and video in separate wl_surface
objects.

This should allow the compositor to pass YUV video buffer processing to
dedicated overlay hardware when possible.
"""

Added new method gst_vaapi_window_wayland_new_with_surface()

Original-Patch-By: Víctor Manuel Jáquez Leal <vjaquez@igalia.com>
                   Zhao Halley <halley.zhao@intel.com>
                   changzhix.wei@intel.com
                   Hyunjun Ko <zzoon@igalia.com>

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-vaapi/-/merge_requests/342>