feat: Add jupytext support for notebooks

[matthewfeickert]

Purpose

• Add jupytext to requirements and rebuild lock files.
• Add jupytext .ipynb to .py pairing rules to pyproject.toml.
• Convert .ipynb to .py:percent with jupytext.
• Ignore .ipynb files to make versioning easier.
• Apply ruff formatting.
• Add section on using jupytext to README.

Does this introduce a breaking change?

[x] Yes
[] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[x] Other... Please describe:

[matthewfeickert]

I'm going to approve and merge this myself as other team members aren't available currently. As always, PRs approved by a single dev can be reverted as needed by the rest of the dev team.

[guenp]

@matthewfeickert I didn't see this PR, could you tag me next time?