[clang] [clang-format] Add basic support for C++/CLI (#27126) (PR #112689)

[Calum Robinson via cfe-commits]

calumr wrote:

#27126 was the issue. I've added a comment there with a clearer example of what clang-format is currently doing to C++/CLI code. 

I appreciate this PR is not complete & I need to add tests. 

https://github.com/llvm/llvm-project/pull/112689