Moptipy

With the new method [check_int_range](https://thomasweise.github.io/moptipy/moptipy.utils.html#moptipy.utils.types.check_int_range), boiler plate integer type + range checks can be consolidated.

Added Unary Operators with Step Size and One Implementation for Permutations

- added the new base class for [unary operators with step size](https://thomasweise.github.io/moptipy/moptipy.api.html#moptipy.api.operators.Op1WithStepSize)
- implemented one such operator, [Op1SwapExactlyN](https://thomasweise.github.io/moptipy/moptipy.operators.permutations.html#module-moptipy.operators.permutations.op1_swap_exactly_n) for permutations
- fixed minor issues discovered by flake8, namely that at three points, exceptions were just created, but not raised
- added a bit more documentation here and there
- completed the Memetic Algorithms experiment for the [Optimization Algorithms](https://thomasweise.github.com/oa).

Improved Documentation

- hopefully fixed the two issues that [CodeQL](https://codeql.github.com/) discovered in our test cases
- improved `README.md` according
- applied the simplifications discovered by [`ruff 0.0.227`](https://pypi.org/project/ruff/0.0.227/)

Added CONTRIBUTING.md and Other Minor Improvements

- COM checks with ruff
- B028 checks by bugbear
- ruff 0.0.224
- flake8-use-fstring 1.4