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

[Björn Schäpers via cfe-commits]

HazardyKnusperkeks wrote:

> > What is your goal with that style?
> 
> It was actually your [idea](https://reviews.llvm.org/D153208#4431239). 😉

I know, but I thought the thought was dropped. :)

So the intent is to use it on our `.clang-format` files?

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