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Differential Revision: D50205775

Pull Request resolved: https://github.com/pytorch/audio/pull/3651

Differential Revision: D50086556

Pull Request resolved: https://github.com/pytorch/audio/pull/3648

Differential Revision: D49965263

Pull Request resolved: https://github.com/pytorch/audio/pull/3639

Summary:
Pull Request resolved: https://github.com/pytorch/audio/pull/3383

This commit reduces `torchaudio::sox_*` namespace into `torchaudio::sox`.
Also put Pybind11 registration and TorchBind registration into anonymous namescope.

Differential Revision: D46257367

fbshipit-source-id: 0f0f181eaa72036916e223263daf4b7c298fca0d

Applies style fixes identified in fbcode.

This PR moves the code related to PyBind11 to the dedicated directory `torchaudio/csrc/pybind`.

Before, features related to PyBind11 (I/O for file-like object) was implemented in `torchaudio/csrc/sox` and the binding was defined in `torchaudio/csrc/pybind.cpp`. We used macro definition `TORCH_API_INCLUDE_EXTENSION_H` to turn on/off the feature, in addition to including/excluding `torchaudio/csrc/pybind.cpp` in the list of compiled source.

In the previous manner, in C++ example, one had to rebuild libtorchaudio separately, but by splitting them completely at compile time, it should conceptually possible to distribute libtorchaudio within torchaudio Python package and reuse it for C++ example.

Co-authored-by: Prabhat Roy <prabhatroy@fb.com>

* Support file-like object in save func

* Disable CircleCI cache for TP artifacts for cleaner build

* Replace save/load function with sox effects chain

* Add sox_utils module

* Make init/shutdown thread safe

* Add sox effects implementation

* Add test for sox effects

* Update docstrings and add examples