Fix black isort

[alexlichtenstein]

Added black and isort pre-commit github action

[micahcarroll]

Once this is merged, we should probably also add it to the overcooked-ai repo, where it's going to be most relevant after the repo merge

[micahcarroll]

Also, other thing that needs to be done before we can merge this is to have the status checks pass! I would wait for #35 to be merged (and merging master into this branch) before running the formatter for all files.

[micahcarroll]

Actually, we might want to deal with #34 before merging this PR, as the diffs will be much simpler before formatting is applied everywhere.