Move TorchAudio-Squim models to Beta

[nateanl]

The PR move SquimObjective and SquimSubjective models and corresponding factory functions and pre-trained pipelines out of prototype and to the core directory. They will be included in the next official release.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/audio/3512

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 5 New Failures, 3 Unrelated Failures

As of commit 162e4f4:

NEW FAILURES - The following jobs have failed:

• build (3.8) (gh)
• Build Linux Conda (gh)
• tests (3.10) / linux-job (gh)
• tests / macos-job (gh)
• unittests-windows-gpu / windows-job (gh)

BROKEN TRUNK - The following jobs failed but were present on the merge base 29903c5:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• tests (3.10, 11.8) / linux-job (gh)
• tests (3.8, 11.8) / linux-job (gh)
• tests (3.9, 11.8) / linux-job (gh)

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[facebook-github-bot]

@nateanl merged this pull request in b7d2d92.

[github-actions]

Hey @nateanl.
You merged this PR, but labels were not properly added. Please add a primary and secondary label (See https://github.com/pytorch/audio/blob/main/.github/process_commit.py).

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Some guidance:

Use 'module: ops' for operations under 'torchaudio/{transforms, functional}', and ML-related components under 'torchaudio/csrc' (e.g. RNN-T loss).

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Regarding examples in code documentations, please also use 'module: docs'.

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Things related to build are by default excluded from the release note, except when it impacts users. For example:
* Drop support of Python 3.7.
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