GstDeviceProvider implementation for WIN Kernel Streaming plugin

GstDeviceProvider implementation for WIN Kernel Streaming plugin

gst_ks_device_provider_probe() is a no-braier, just runs ks_enumerate_devices()
and reports the results.

Monitoring is a bit more tricky. We have to create a dummy message-processing
window and register device change notifications for it.

As kernel streaming can (and should) be used for audio capture and audio
playback, this change also has certain placeholders for such.

https://bugzilla.gnome.org/show_bug.cgi?id=747757