To quote Ruff's README: "An extremely fast Python linter, written in Rust".

In my testing Ruff takes 200ms to lint the entire codebase whereas flake8
takes about 5.5 seconds (27x slower). Running `pre-commit run -a` only takes
about 2.3 seconds now, which should make local dev work a bit faster (assuming
you run linters regularly).

Ruff includes a lot of rules out of the box, including all the (important)
rules from `flake8`, `flake8-bugbear`, `flake8-noqa`, and many more. Having
all these built-in rules makes it much easier to incrementally improve the
codebase without having to install tons of flake8 plugins.

I made sure that the configs matched as close as I could get them. Some minor
rules like line indentation and such aren't in Ruff since they are always just
disabled. Ruff also ignores everything in the `.gitignore` file, so that cleans
up the exclude section.

Lastly, the `test-data` section seemed to have its own `.flake8` config file,
but it was disabled in the `setup.cfg` file. I migrated the config over, but
it doesn't really matter because it is being ignored anyways. Is this
intentional?

Co-authored-by: Alex Waygood <[email protected]>