[clang-tidy] Add new check `llvm-prefer-static-over-anonymous-namespace` (#142839) Finds function and variable declarations inside anonymous namespace and suggests replacing them with ``static`` declarations. The check will enforce that [restrict-visibility](https://llvm.org/docs/CodingStandards.html#restrict-visibility) rule in LLVM Coding Standards is followed correctly (by adding `static` to functions instead of putting them in anonimous namespace). The check has additional levels of "strictness" represented by Options. By default, the check works in the most relaxed way by giving warning only for methods and functions defined in anonymous namespaces. Also, It finds `static` functions that are placed inside anonymous namespace - there is no point in keeping them inside.
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