[clang-tools-extra] [clang-tidy] Add new check `llvm-prefer-static-over-anonymous-namespace` (PR #142839)

[Julian Schmidt via cfe-commits]

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5chmidti wrote:

It would be better to combine these files with a check suffix and two RUN lines so that you can check tru-negatives for the options as well. Depending on the options the matches should be a strict superset for cars or member functions, e.g. a ` -check-suffix=,VAR

https://github.com/llvm/llvm-project/pull/142839