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Summary:
After all the C++ code from https://github.com/pytorch/audio/issues/2072 are added, this commit will enable decoder/KenLM integration in the build process.

Pull Request resolved: https://github.com/pytorch/audio/pull/2078

Reviewed By: carolineechen

Differential Revision: D33198183

Pulled By: mthrok

fbshipit-source-id: 9d7fa76151d06fbbac3785183c7c2ff9862d3128

Summary:
Add KenLM and its dependencies required for static build (`zlib`, `bzip2`, `lzma` and `boost-thread`).

The KenLM and its dependencies are build but since no corresponding code on torchaudio side is changed, the resulting torchaudio extension module is not changed. (therefore, as long as build process passes on CI this PR should be good to go.)

Pull Request resolved: https://github.com/pytorch/audio/pull/2076

Reviewed By: carolineechen

Differential Revision: D33189980

Pulled By: mthrok

fbshipit-source-id: 6096113128b939f3cf70990c99aacc4aaa954584

This commit fixes the local build on Windows with CUDA.

* Split `libtorchaudio` and `_torchaudio`

This change extract the core implementation from `_torchaudio` to `libtorchaudio`,
so that `libtorchaudio` is reusable in TorchScript-based app.

`_torchaudio` is a wrapper around `libtorchaudio` and only provides PyBind11-based
features. (currently file-like object support in I/O)

* Removed `BUILD_LIBTORCHAUDIO` option

When invoking `cmake`, `libtorchaudio` is always built, so this option is removed.

The new assumptions around the library discoverability

- In regular OSS workflow (`pip`/`conda`-based binary installation), both `libtorchaudio` and `_torchaudio` are present.
    In this case,`libtorchaudio` has to be loaded manually with `torch.ops.load_library` and/or `torch.classes.load_library` otherwise importing `_torchaudio` would not be able to resolve the symbols defined in `libtorchaudio`.
- When `torchaudio` is deployed with PEX format (single zip file)
  - We expect that`libtorchaudio.so` exists as a file in some search path configured by client code.
  - `_torchaudio` is still importable and because we do not know where `libtorchaudio` will exist, we will let the dynamic loader resolve the dependency from `_torchaudio` to `libtorchaudio`, which should work as long as `libtorchaudio` is in a library search path (search path is not modifiable from already-running Python process).

* fix build error on ROCM

* Update CMakeLists.txt
Co-authored-by: Nikita Shulga <nikita.shulga@gmail.com>

* address comments and fix cuda detction on rocm
Co-authored-by: Nikita Shulga <nikita.shulga@gmail.com>

Needed to support CUDA builds on CPU machine

Parse `TORCH_CUDA_ARCH_LIST` as new-CUDA-language Cmake-3.18+ style [CMAKE_CUDA_ARCHITECTURES](https://cmake.org/cmake/help/latest/prop_tgt/CUDA_ARCHITECTURES.html#prop_tgt:CUDA_ARCHITECTURES)

* 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.

* Switch to cmake for build
* Hide symbols