[clang] [clang-format] Add a new style for the clang-format source code (PR #69814)

[Emilia Kond via cfe-commits]

rymiel wrote:

> I don't want to "advertise" this new style in the documentation but am willing to be overruled by the majority.

But you added it to the help text?

(I'm fine with this being undocumented)

https://github.com/llvm/llvm-project/pull/69814