[clang] [clang-format] add an option to insert a space only for non-code block empty braces, not for empty parentheses (PR #93634)

[Kohei Asano via cfe-commits]

khei4 wrote:

I confirmed [the update of WebKit Code Style Guideline for empty braces](https://github.com/WebKit/WebKit/pull/29668). I make WebKit style insert a space in any empty braces. I also updated document by script.

https://github.com/llvm/llvm-project/pull/93634