[clang-tools-extra] [clang-tidy][readability-identifier-naming] Support namespace aliases (PR #112112)

[Danny Mösch via cfe-commits]

https://github.com/SimplyDanny approved this pull request.

LGTM! Please add an entry to `clang-tools-extra/docs/ReleaseNotes.rst`.

https://github.com/llvm/llvm-project/pull/112112