pyproject.toml & switch to Ruff (#976)

* unify config to pyproject.toml
replace flake8 with Ruff

* drop configs

* update

* fixing

* Apply suggestions from code review

Co-authored-by: Zvi Baratz <z.baratz@gmail.com>

* setup

* ci

* pr template

* reword

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Co-authored-by: Zvi Baratz <z.baratz@gmail.com>
Co-authored-by: Li Jiang <lijiang1@microsoft.com>