ci: added isort

[mjspeck]

Related Issues

• fixes Sort imports with isort #5931

Proposed Changes:

Added isort to pyproject.toml and .pre-commit-config.yaml

How did you test it?

manual verification

Notes for the reviewer

• Have not committed changes using isort because that will change a lot of code and make seeing the important changes difficult.
• I have not yet modified any github pipeline files since it would probably make sense to talk with a maintainer about that.

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[silvanocerza]

I believe this to be in a good enough state so I marked it as ready to review to approve it.
In following PRs we can add a CI check and format all the files that require it.