* sort pre-commit file

* pre-commit: add ruff

* pre-commit run -a

* manual ruff fixes

* README: add ruff badge

* pre-commit: add isort

* pre-commit run -a

* ignore previous commit in blames

* add changelog entry

* replace black & isort by ruff

* ruff: more linters

* clean config files

* pre-commit run -a

* ignore previous commit in blames

* fix NPY002

ref. https://numpy.org/doc/stable/reference/random/legacy.html

* remove useless code

* fix dtype conversion

for more information, see https://pre-commit.ci

[unittest/python] add test_struct

+ do not test slice for std::array<Eigen..., k>