[vpdq] Use scikit-build-core build backend for Python binding

[ianwal]

Summary

WIP. Follow up PR to some comments in #1711. Posting draft now in case I don't end up finishing it soon and someone else wants to pick it up and for general input. Seems like a no-brainer if it works, though.

Replace the hackish custom setup.py script that is used to build the Cython binding with scikit-build-core

Basic code skeleton taken from the scikit-build-core example

No API changes for the end user. ABI change is not a concern for the Python binding, as the entire library will be replaced on upgrade.

TODO:

• Set [tool.scikit-build.cmake.build-type] to RelWithDebInfo

• Ensure we don't need cmake in requires in pyproject.toml. Double check the scikit-build-core docs for this.

• Add scikit-build-core with a known good version to requirements.txt, remove setuptools

Test Plan

CI tests building and installing locally.

TODO:

• Test building sdist in one venv and installing in another fresh venv
• Test building wheel on one Linux distro and installing on another (for good measure)
• Test uploading wheel to PyPI test server and installing it.

[Dcallies]

Thanks again for the help!