[clang-tools-extra] [clang-tidy] new check readability-mark-static (PR #90830)

[Piotr Zegar via cfe-commits]

PiotrZSL wrote:

> Maybe I can provide an option to treat some extension as main file also.

Clang-tidy already got those options, check just need to utilize them.


https://github.com/llvm/llvm-project/pull/90830