[Data / General] Set up pre-commit hooks or linting

[lauriemerrell]

It would be helpful to set up some pre-commit configuration (https://pre-commit.com/) for this repo so that we are automatically running a linter (perhaps black).

Acceptance criteria would include:

• Configuring some pre-commit hooks; probably at least something to standardize spacing type things
• Adding the relevant dependencies to the top-level requirements.yml file for the repo
• Adding documentation to the repo README if needed to explain the checks