[clang] [CIR] Add .clang-tidy files for ClangIR specific coding style rules (PR #111417)

[Erich Keane via cfe-commits]

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

I don't have a good idea of what the whole list should BE, but htis seems reasonable to me.

https://github.com/llvm/llvm-project/pull/111417