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Summary:
This commit adds CUDA frame support to FilterGraph

It initializes and attaches CUDA frames context to FilterGraph,
so that CUDA frames can be processed in FilterGraph.

As a result, it enables
1. CUDA filter support such as `scale_cuda`
2. Properly retrieve the pixel format coming out of FilterGraph when
   CUDA HW acceleration is enabled. (currently it is reported as "cuda")

Resolves https://github.com/pytorch/audio/issues/3159

Pull Request resolved: https://github.com/pytorch/audio/pull/3183

Reviewed By: hwangjeff

Differential Revision: D44183722

Pulled By: mthrok

fbshipit-source-id: 522d21039c361ddfaa87fa89cf49c19d210ac62f

Summary:
Add GitHub Action-based GPU test jobs.
- It seems that there is 2 hour upper cap so only running CUDA/GPU tests.
- Since Kaldi related features are not available, they are disabled.

Pull Request resolved: https://github.com/pytorch/audio/pull/3029

Reviewed By: hwangjeff

Differential Revision: D42983800

Pulled By: mthrok

fbshipit-source-id: 47fefe39c635d1c73ad6799ddacefd2666fe5403