Investigate if we should use `pip's` _in_process.py file to build wheels from sdists

[wolfv]

We could use pip's version of the wheel building frontend:

https://github.com/pypa/pip/blob/5efa3e83d90b1d64fbf0104d2ba84bef8d7e9648/src/pip/_vendor/pyproject_hooks/_in_process/_in_process.py

Has a similar "API" with JSON files and whatnot.

[tdejager]

Looks pretty nice, would you want to vendor it?