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This code was added as a part of investigation of inconsistent behavior
of file-like object support. Now the investigation is done and this code
does not provide much insight yet adding a bunch of lines to the log, so
this PR removes it.

Merges lfilter and spectrogram classes together in the common implementation and modifies the cpu and gpu test definitions accordingly

This reverts commit 8d2eeb11.

* Added CodeQL and Bandit security checks as GitHub Actions

* Fixed renegerate jinja2 bug

* Removed specific Bandit fixes

* Update spectrogram to use complex
* Update autograd test
* Update TS test
* Update librosa test

1. `F.phase_vocoder` accepts Tensor with complex dtype.
    * The implementation path has been updated from #758 so that they share the same code path by internally converting the input Tensor to complex dtype and performing all the operation on top of it.
    * Adopted `torch.polar` for simpler Tensor generation from magnitude and angle.
2. Updated tests
    * librosa compatibility test for complex dtype and pseudo complex dtype
        * Extracted the output shape check test and moved it to functional so that it will be tested on all the combination of `{CPU | CUDA} x {complex64 | complex128}`
    * TorchScript compatibility test for `F.phase_vocoder` and `T.TimeStretch`.
    * batch consistency test for `T.TimeStretch`.

Co-authored-by: krishnakalyan3 <skalyan@cloudera.com>

Co-authored-by: krishnakalyan3 <skalyan@cloudera.com>

This PR additionally adds batching to kaldi compliance resample interface.

* Change the name of the specgram named `waveform`

`F.sliding_window_cmn` takes a spectrogram as input (of shape
`(..., freq, time)`). However, this spectrogram is named `waveform`.
This appears to be an error, so rename this (and the output tensor) to
reflect that both are spectrograms.

* Correct tensor description in docstring

The output tensor of `F.sliding_window_cmn` is also a spectrogram.
Update the description to reflect this.