Add pyproject, pre commit

[elliottower]

Didn't change the requirements, adapted from pettingzoo pyproject. Didn't go through pre commit yet

[elliottower]

I had to comment out a number of flake8 things and pyright errors, but I know at least this was one of them that seemed fixable:

https://stackoverflow.com/questions/69983472/how-to-satisfy-flake8-w605-invalid-escape-sequence-and-string-format-in

You can search through files for W605 and then remove that line and re-run the pre-commit in order to find the file which causes the issue. Not a huge deal I wouldn't imagine but just posting cause that's at least one I looked up.

[elliottower]

It looks like the CONTRIBUTING.md file already has some instructions for installing pre-commit, I'm gonna guess that pre-commit was included in previous versions of the project? Tested it without the pre-commit config though and it gave an error, so until now I think that part of the documentation was invalid.

[pseudo-rnd-thoughts]

Could you split this into two pr to make it clear what was changed for pyproject and pre commit for the future