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

[Björn Schäpers via cfe-commits]

HazardyKnusperkeks wrote:

> Where is the documentation for the value? CLion reports `clang-format` option as an error by the reason. No doc, no schema rule.

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

There is none, on purpose.


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