Better implementation of best practices

[dwhswenson]

• Switch dev tooling from black to ruff (review comment)
• Add recommended pre-commit hook
• Add some formatting checks (review comment)
• Add coverage / CodeCov
• CONTRIBUTING.md
• PR template for new devs
• README instructions for how to use the tool

[ethanholz]

We also are going to want to add:

• CONTRIBUTING.md ( I like this: https://github.com/widal001/python-boilerplate/blob/main/CONTRIBUTING.md, we can modify with our own eco-infra flair)
• Potentially a PR template for new devs
• README instructions for how to use the tool