add `black` to handle python code formatting

[Adamtaranto]

I'm using Ruff locally in keeping with the Rust for everything theme (which would be why the pytests have been reformatted).

Do you want to have a pre-commit to run Ruff / Black on python files for new commits?

• Ruff for Github Actions
• Ruff with github actions

[Adamtaranto]

@ctb how does that sound? alt if you have an example of a different action you want to use I can set it up here.

[ctb]

sounds good to me!