Add Cosmos3 video2video generation support (#13896)
* Init v2v cosmos3 commit
* Add user quide; prompt upsampling is TBD
* Apply style fixes
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Co-authored-by: dg845 <58458699+dg845@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
