feat(workflows): cibuildwheel integration

[XuehaiPan]

Description

Describe your changes in detail.

Motivation and Context

Use cibuildwheel to build manylinux wheels in GitHub Actions and update the contribution guide.

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• New feature (non-breaking change which adds core functionality)

Checklist

Go over all the following points, and put an x in all the boxes that apply.
If you are unsure about any of these, don't hesitate to ask. We are here to help!

• I have read the CONTRIBUTION guide (required)
• My change requires a change to the documentation.
• I have updated the tests accordingly (required for a bug fix or a new feature).
• I have updated the documentation accordingly.
• I have reformatted the code using make format (required)
• I have checked the code using make lint (required)
• I have ensured make test pass. (required)

[XuehaiPan]

See #46 (comment).

We only need to link libtorch_python.so instead of globbing for all shared libraries.

[XuehaiPan]

I think this is ready to merge now @Benjamin-eecs @JieRen98. I can build py310 wheels on my local machine (inside docker). The build errors may be resolved in the next PyTorch minor release (1.12.1).

[Benjamin-eecs]

Wondering what is no-build-isolation, seem a bit complicated for new users or ones who didn't go through readme.

[XuehaiPan]

Wondering what is no-build-isolation

We list torch == 1.12.0 as our build dependency to get torch libs and includes at build time. Now the default behavior for pip install -e will build a wheel in an isolated environment before installation. If the user does not set environment variable PIP_EXTRA_INDEX_URL=https://download.pytorch.org/whl/cu116", pip will install torch from PyPI, which is torch == 1.12.0+cu102, for building our C++ extension.

seem a bit complicated for new users or ones who didn't go through readme.

We only link libtorch_python.so now, the user can use pip3 install -e . without any problem.

The case to add the --no-build-isolation option is to reduce unnecessary downloads for torch wheels from PyPI. The wheel builder can use the already installed torch for compilation.