[COMPARISON TESTS] Use pre-computed values in librosa compat test

[samanklesaria]

This PR adds functionality for both saving files containing pre-computed values and using these precomputed values for testing that torchaudio's implementations of functionality is the same as that offered by librosa.

[pytorch-bot]

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❌ 12 New Failures

As of commit 91daa09 with merge base 0c22347 ():

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-macos-cpu.yml (gh)
• .github/workflows/unittest-windows-cpu.yml (gh)
• .github/workflows/unittest-windows-gpu.yml (gh)
• Build Aarch64 Linux Wheels / pytorch/audio / build-wheel-py3_9-cuda-aarch6412_9-aarch64 (gh)
  ImportError: /lib64/libm.so.6: version GLIBC_2.29' not found (required by /usr/local/cuda/lib64/libnvshmem_host.so.3)`
• Build Aarch64 Linux Wheels / pytorch/audio / upload / upload-wheel-py3_9-cuda-aarch6412_9-aarch64 (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_audio__3.9_cu129_aarch64
• Build documentation / build / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• Build Windows Wheels / pytorch/audio / build-wheel-py3_9-cuda12_9 (gh)
• 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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[samanklesaria]

GPU tests are failing because CI is using an old version of numpy still.