[clang-tools-extra] [clang-tidy][NFC] Add custom .clang-format with 'QualifierAlignment: Left' (PR #155852)

[Carlos Galvez via cfe-commits]

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

LGTM! Worth keeping in mind that this new .clang-format file makes clang-tidy potentially disconnected from the rest of the repo, in case the top-level file were to introduce new options. But hopefully everything is baked into the "LLVM" style.

https://github.com/llvm/llvm-project/pull/155852