Migrate from flake8, isort, and black to ruff

"An extremely fast Python linter and code formatter, written in Rust.", says [ruff documentation](https://docs.astral.sh/ruff/).

It provides "Drop-in parity with [Flake8](https://docs.astral.sh/ruff/faq/#how-does-ruffs-linter-compare-to-flake8), isort, and [Black](https://docs.astral.sh/ruff/faq/#how-does-ruffs-formatter-compare-to-black)".
