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

[Congcong Cai via cfe-commits]

HerrCai0907 wrote:

> * The auto-fix should be configurable to choose `static` or anonymous namespace.

Should I implement auto-fix for this check? Maybe some functions / variables will be marked incorrectly and cause link error because the coder just forget to include the header file but this check mark it as internal linkage.
WDYT? @carlosgalvezp @PiotrZSL @EugeneZelenko @SimplyDanny 

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