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

[Alexey Utkin via cfe-commits]

alexey-utkin wrote:

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

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