Automate Style with Standard Libraries

[ryanohoro]

Is your feature request related to a problem? Please describe.

The style guidelines for this project suggest PEP8 conformance, but the project itself provides no way to ensure it.

Describe the solution you'd like

Add black, isort, mypy, and flake8 to build actions (checks) and pre-commit hooks (fixes, checks).

Add yamlfix to pre-commit hooks (fixes).

Pre-commit hooks run before a git commit, cleaning up style and alerting to problems.

Describe alternatives you've considered

Additional context

Running style automation on the repo will introduce one-time changes in most files, which will require additional merging into other forks.