[clang-tools-extra] create new clang-tidy check to add namespaces to symbol references (PR #70621)

[Piotr Zegar via cfe-commits]

https://github.com/PiotrZSL requested changes to this pull request.

I like an idea, but this check require lot of work.
Todo:
- Update to LLVM codding standard - https://llvm.org/docs/CodingStandards.html
- Remove any custom diagnostic and things (noise) that aren't needed to make check function
- Update code to C++17
- Add more test
- Improve documentation

https://github.com/llvm/llvm-project/pull/70621