chore: replace `flake8`, `flake8-spellcheck`, `isort` and `black` with `ruff` and `codespell`

[danceratopz]

Replace flake8, flake8-spellcheck, isort and black with ruff and codespell. Motivation: ruff is insanely fast. For the conversion, it won't be possible to maintain both systems side-by-side, as there are known deviations from black.

This will touch a few source files, but shouldn't be too drastic (like #137).

• ruff normalizes hex to lower case (black doesn't).
• ruff forces an additional newline following a module docstring.

[danceratopz]

This will greatly simplify things (not a fan of this doc page!):

[raxhvl]

on it!

[danceratopz]

Thanks @raxhvl, appreciate it, but @spencer-tb's actively working on this at the mo.

Feel free to reach out if there's something else you'd particularly like to work on https://ethereum.github.io/execution-spec-tests/main/getting_help/.

[raxhvl]

Thanks for the quick heads up. I'll discuss on discord.

[raxhvl]

Quick note - do the docs says #testing in Eth R&D but i think it should be #el-testing?

[danceratopz]

Quick note - do the docs says #testing in Eth R&D but i think it should be #el-testing?

Oh yeah, that's right, the discord got updated. Thanks! I can take that one to save you opening a PR just for that 🙂 I have a few misc improvements i need to make.

Also feel free to DM on discord.

[winsvega]

@danceratopz, @spencer-tb
Ruff is there now.
Codespell?