Draft: waylandsink: Fix state transitions

Copied from https://gitlab.freedesktop.org//gstreamer/gst-plugins-bad/-/merge_requests/2331

Transition through READ or NULL are currently broken. This MR aims to address this. I have cleanup and fixed the NULL sate transition.


  • Figure-out why there is a miss-render on gnome-shell in NULL->PAUSE transition
  • Fix READY -> PAUSE/PLAYING transition

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