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overlaycomposition: Add support for blending upstream composition

Seungha Yang requested to merge seungha.yang/gstreamer:overlay-refactor into main
By this commit, overlaycomposition will be able to blend
upstream overlay-compositions with video frames if downstream
does not support the meta.

Summary of changes
* Port to basetransform
* Notify upstream that overlay-composition meta is always supported
  by this element during negotiation. Then decision whether
  blending is needed or not will be made by this element
Edited by Seungha Yang

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