Add torchcodec mock with wav loading and saving

[samanklesaria]

This mock module will allow tests that load and save audio to still work as long as they only load and save wavs (which they all do).

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/audio/3986

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❌ 14 New Failures

As of commit 2e25279 with merge base 00b0c91 ():

NEW FAILURES - The following jobs have failed:

• .github/workflows/bandit.yml (gh)
• .github/workflows/integration-test.yml (gh)
• .github/workflows/lint.yml (gh)
• .github/workflows/pr-labels.yml (gh)
• .github/workflows/unittest-linux-gpu.yml (gh)
• .github/workflows/unittest-macos-cpu.yml (gh)
• .github/workflows/unittest-windows-cpu.yml (gh)
• .github/workflows/unittest-windows-gpu.yml (gh)
• Build Windows Wheels / pytorch/audio / build-wheel-py3_9-cuda12_6 (gh)
  C:/actions-runner/_work/_temp/conda_environment_16379225542/Lib/site-packages/torch/include\torch/csrc/dynamo/compiled_autograd.h(1135): error C2872: 'std': ambiguous symbol
• Build Windows Wheels / pytorch/audio / build-wheel-py3_9-cuda12_8 (gh)
  C:/actions-runner/_work/_temp/conda_environment_16379225542/Lib/site-packages/torch/include\torch/csrc/dynamo/compiled_autograd.h(1135): error C2872: 'std': ambiguous symbol
• Build Windows Wheels / pytorch/audio / build-wheel-py3_9-cuda12_9 (gh)
  C:/actions-runner/_work/_temp/conda_environment_16379225542/Lib/site-packages/torch/include\torch/csrc/dynamo/compiled_autograd.h(1135): error C2872: 'std': ambiguous symbol
• Build Windows Wheels / pytorch/audio / upload / upload-wheel-py3_9-cuda12_6 (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_audio__3.9_cu126_x64
• Build Windows Wheels / pytorch/audio / upload / upload-wheel-py3_9-cuda12_8 (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_audio__3.9_cu128_x64
• Build Windows Wheels / pytorch/audio / upload / upload-wheel-py3_9-cuda12_9 (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_audio__3.9_cu129_x64

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