DX: use a pre-commit hook to press commiters to ensure codestyle is consistent

[hcientist]

1. do we really want a client-side pre-commit hook to enforce formatting? (maybe not because then we can't "save" our progress)
2. definitely want something for when a PR is opened to either autoformat, or add a comment/error something that the requester should format their code before expecting the PR to be reviewed
3. start by ensuring that the python black formatter is running for you in vscode, and figure out the commandline to make it run against all python files in the backend and open a pr to merge the formatted version