Consider replacing flake8 and iSort with ruff

[theskumar]

Ruff is a replacement for flake8, implemented in rust for performance. It supports many flake8 plugins by default and is compatible with iSort and black.

The downside is that we might use some flake8 plugins, but this project does not use many flake8 plugins or intend to use more.

See: https://github.com/charliermarsh/ruff#how-does-ruff-compare-to-flake8

[CuriousLearner]

Looks good, I will give this a try in another project.