chore: get rid of setup.py/setup.cfg

[skshetry]

And misc maintenace updates:

• Move all of the configs to pyproject.toml instead of 3 config.
• Remove isort/black/flake8 in favor of ruff
• Use local mypy hook instead of mirrors-mypy, as it hides a lot of errors.
• Changes line-length to 88 (default in ruff). Luckily, this did not change any diff.
• Add support for Python 3.12, and run tests in CI for 3.12.
• Introduce dev dependency extra.

The ruff rules are equivalent to flake8. We can expand them in a separate PR if needed.
Also, I haven't removed pylint. If we expand ruff rules, we can get rid of pylint.
But that can be done in the next PR as my goal with this PR is to get rid of setup.py/setup.cfg.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.37%. Comparing base (d4852de) to head (69dcd12).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #447   +/-   ##
=======================================
  Coverage   85.37%   85.37%           
=======================================
  Files          19       19           
  Lines        2120     2120           
=======================================
  Hits         1810     1810           
  Misses        310      310           

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[shcheklein]

thanks @skshetry , great update!