Extend clang-tidy checks

[Yaraslaut]

trafficstars

List of existing clang-tidy checks: https://clang.llvm.org/extra/clang-tidy/checks/list.html

We can add some new checks, similar to readability-function-cognitive-complexity

Also, maybe we can turn some of the checks from warnings into errors inside CI

[christianparpart]

I am all in for improved quality of code constraints. :+1: