mfdeviceprovider: Add support for device update

Similar to the wasapi2 plugin, GstWinRT library will be used for UWP,
and adding new GstWin32DeviceWatcher object implementation for
Win32 desktop application.

Part-of: <gstreamer/gstreamer!947>
23 jobs for !947 with winrt-lib in 55 minutes and 4 seconds (queued for 3 seconds)
merge request