Automatic `black`

[jank324]

Should we set up black to automatically format the code on commits or pushes? Right now it only checks and complains when the code is not formatted correctly.

[jank324]

@cr-xu didn't you look into this before?

[cr-xu]

On a second thought, maybe requiring the contributors to install pre-commit is a better solution
So... pros and cons of using GH Actions to reformat and commit:
Pro:

• Contributor don't need to care about the formatting

Con:

• Contributor would need to pull everytime the new code after the Github Action is done, otherwise might risk running into merge conflicts
• Commit history would be heavily populated/doubled
• I think the commit wouldn't work in a PR created from a public fork (like the Space charge case) due to how Github handles secret

[jank324]

The cons seem to clearly outweigh the pros here. I think we should leave it as is, and maybe (a) make the contribution guidelines more comprehensive and (b) add a checkmark to PRs "I have read the contribution guidelines".