Update lint

[robertdstein]

Bump black version, add isort for prettifying dependencies, add option for pre-commit.

Nearly every file is affected by this PR, but the changes in almost all files are cosmetic.

[JannisNe]

I think we should do this. However, this could be a potential nightmare for people doing analyses right now and have modified their flarestack. In that case merging the these changes into main will result in many, many conflicts. As far as I am aware, this could affect @sathanas31, @TeresaPernice and also @mlincett. I will check that any potential PRs are done in the next couple of days before we proceed with this, if there is no urgency, @robertdstein.

• @sathanas31
• @mlincett
• @TeresaPernice

[robertdstein]

Sure, no urgency and you can also just close this PR if it's not helpful.

[mlincett]

No blockers from my side.

(If we need to touch this again in the future, I would suggest looking at ruff that I have used in other situations to replace black and flake8).