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Summary:
This commit enables ffmpeg-feature build in tests and
binary builds of all platforms.
(Linux/macOS/Windows x conda/wheel)

It also moves the definition of BUILD_FFMPEG env vars to the
top level `config.yml`.

 ---
Manual checking if all the build log contains `libtorchaudio_ffmpeg`.
### binary build
- [x] `binary_linux_conda_py3.7_cpu`
- [x] `binary_linux_conda_py3.7_cu102`
- [x] `binary_linux_wheel_py3.7_cpu`
- [x] `binary_linux_wheel_py3.7_cu102`
- [x] `binary_macos_conda_py3.7_cpu`
- [x] `binary_macos_wheel_py3.7_cpu`
- [x] `binary_windows_conda_py3.7_cpu`
- [x] `binary_windows_conda_py3.7_cu113`
- [x] `binary_windows_wheel_py3.7_cpu`
- [x] `binary_windows_wheel_py3.7_cu113`

### test
- [x] `unittest_linux_cpu_py3.7`
- [x] `unittest_linux_gpu_py3.7`
- [x] `unittest_macos_cpu_py3.7`
- [x] `unittest_windows_cpu_py3.7`
- [x] `unittest_windows_gpu_py3.7`
- [x] `integration test`

Pull Request resolved: https://github.com/pytorch/audio/pull/2140

Reviewed By: hwangjeff

Differential Revision: D33464430

Pulled By: mthrok

fbshipit-source-id: 2c5b72be75d49019bf1599036180d4e56074e46b

This commit changes the build process so that the third party code are fetched automatically when `setup.py` is invoked.

This is to allow
1. `build_sdist` to contain the third party library codes, so that source code distribution created at the time release tag is created is complete.
2. It makes it possible to do `pip install https://github.com/pytorch/audio.git`.
    Example:
    ```
    !pip install 'cmake>=3.18' ninja
    !pip install --verbose git+https://github.com/pytorch/audio.git@auto-source
    ```

This reverts commit 0822fc05.

Include the list of labels.

* Default to BUILD_SOX=1 in non-Windows systems

Since the adaptation of CMake and restricting to the static linking of libsox,
the build process has become much robust with libsox integration enabled.

This commit makes it default behavior to build libsox integration in non-Windows systems.
The build process still checks BUILD_SOX env var so, setting `BUILD_SOX=0` disables it.

* Added CodeQL and Bandit security checks as GitHub Actions

* Fixed renegerate jinja2 bug

* Removed specific Bandit fixes