UI: Add support for additional canvases to multitrack video output #10635
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This PR depends on #10633
Description
Adds frontend API calls to allow plugins to register additional canvases/video outputs that will participate in multitrack video configuration generation and multitrack video streams
Motivation and Context
Currently additional views/canvases have to use separate rtmp connections or similar to be streamed, where the multitrack video output allows both multiple renditions of the same view and also different views to be streamed
How Has This Been Tested?
Twitch Enhanced Broadcasting beta
Types of changes
Checklist: