[clang] [clang-format] Add SpacesInComments option for block comments (PR #204727)

[via cfe-commits]

frank-suwen wrote:

Thanks for the suggestion. The latest update includes the result of running `clang/docs/tools/dump_format_style.py` and the newly added config parse test. The fixes to other minor comments on the code are included as well. 

https://github.com/llvm/llvm-project/pull/204727