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Summary:
This commit removes compute_kaldi_pitch function and the underlying Kaldi integration from torchaudio.

Kaldi pitch function was added in a short period of time by integrating the original Kaldi implementation, instead of reimplementing it in PyTorch.

The Kaldi integration employed a hack which replaces the base vector/matrix implementation of Kaldi with PyTorch Tensor so that there is only one blas library within torchaudio.

Recently, we are making torchaudio more lean, and we don't see a wide adoption of kaldi_pitch feature, so we decided to remove them.

See some of the discussion https://github.com/pytorch/audio/issues/1269

Pull Request resolved: https://github.com/pytorch/audio/pull/3368

Differential Revision: D46406176

Pulled By: mthrok

fbshipit-source-id: ee5e24d825188f379979ddccd680c7323b119b1e

Summary:
This fixes:
```
Installed flake8: + flake8 --version
Traceback (most recent call last):
  File "/root/project/env/bin/flake8", line 6, in <module>
    from flake8.main.cli import main
  File "/root/project/env/lib/python3.7/site-packages/flake8/main/cli.py", line 6, in <module>
    from flake8.main import application
  File "/root/project/env/lib/python3.7/site-packages/flake8/main/application.py", line 24, in <module>
    from flake8.plugins import manager as plugin_manager
  File "/root/project/env/lib/python3.7/site-packages/flake8/plugins/manager.py", line 11, in <module>
    from flake8._compat import importlib_metadata
  File "/root/project/env/lib/python3.7/site-packages/flake8/_compat.py", line 7, in <module>
    import importlib_metadata
ModuleNotFoundError: No module named 'importlib_metata'
```

Pull Request resolved: https://github.com/pytorch/audio/pull/2191

Reviewed By: atalman

Differential Revision: D33930583

Pulled By: malfet

fbshipit-source-id: 68026743c29434113893cca38041596135d3bd53

* Separate style check from unit test

* TEST flake8 fail

* TEST clang-format fail

* Revert "TEST flake8 fail"

This reverts commit 88d90185cefe294b9a662129a05c2e26a9844fe4.

* Revert "TEST clang-format fail"

This reverts commit 93517d1ccba650a6ccd813268fd73a4fd63b252c.