Add YUV to RGB conversion in GPU Video decoder

[fmassa]

Tests don't pass yet. Need to figure out if this is expected or not.

Tests contain extra debug code that should be cleaned up before merging.

[facebook-github-bot]

💊 CI failures summary and remediations

As of commit 5c66ab7 (more details on the Dr. CI page):

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• 2/5 failures introduced in this PR
• 3/5 broken upstream at merge base 93191f8 since Dec 30

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🕵️ 1 new failure recognized by patterns

The following CI failures do not appear to be due to upstream breakages:

lint_c (1/1)

Step: "Lint C code" (full log | diagnosis details | 🔁 rerun)

check_for_cuda_errors(cuStreamSynchronize(cuvidStream), __LINE__, __FILE__);

�[0m�[32m+      source_pitch,
�[0m�[32m+      frame_ptr,
�[0m�[32m+      width * 3,
�[0m�[32m+      {(int)decoded_frame.size(1), (int)decoded_frame.size(0)});
�[0m�[32m+
�[0m�[32m+  TORCH_CHECK(
�[0m�[32m+      err == NPP_NO_ERROR,
�[0m�[32m+      "Failed to convert from NV12 to RGB. Error code:",
�[0m�[32m+      err);
�[0m 
   check_for_cuda_errors(cuStreamSynchronize(cuvidStream), __LINE__, __FILE__);
   decoded_frames.push(decoded_frame);


Exited with code exit status 1

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1 failure not recognized by patterns:

Job	Step	Action
lint_python_and_config	Lint Python code and config files	🔁 rerun

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🚧 3 ongoing upstream failures:

These were probably caused by upstream breakages that are not fixed yet.

• unittest_macos_cpu_py3.6 since Dec 30 (64d21d1)
  • 🔁 rerun
• unittest_linux_cpu_py3.6 since Dec 30 (64d21d1)
  • 🔁 rerun
• unittest_windows_cpu_py3.6 since Dec 30 (64d21d1)
  • 🔁 rerun

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