Update linting; Minor fixes to pass linting

[martinhoyer]

In case this is something you'd like...

• adding .pre-commit-config.yaml for people using pre-commit.
• adding ruff to ci, this also replaces isort
• Cargo.toml is sorted using cargo-sort
• Updating linter configs in pyproject.toml
• I'm very sorry about modifying the sorting and style of pyproject.toml again. Only now I learned that 'build-system' is supposed to be before 'project'. Adding validate-pyproject linting to pre-commit yaml.
• index.py has one unused import and linters were complaining about from x import * and about the docstring line being too long.

[SamuelYvon]

Thanks for the work! I'll change a few things but nothing major. Thanks again!