[clang-tools-extra] Add check 'modernize-use-enum-class' (PR #138282)

[Philipp Jung via cfe-commits]

JungPhilipp wrote:

> Your branch seems to be way behind current `main`, and `clang-tools-extra/docs/ReleaseNotes.rst` seems to be from already released 20th version of LLVM. (I don't know how can it even show some kind of diff) Could you please rebase on fresh `main` branch.

Done

https://github.com/llvm/llvm-project/pull/138282