[clang] [clang-format] Add null-terminated path option (#123921) (PR #123926)

[Nikolaos Chatzikonstantinou via cfe-commits]

createyourpersonalaccount wrote:

@owenca @mydeveloperday @HazardyKnusperkeks I'll ping now that it's the weekend, perhaps you have some time to look at this more; in particular now I got the `--null` option to work for `--staged`, but I'm not sure how you'd like it to work for other options. I've explained my concerns in https://github.com/llvm/llvm-project/pull/123926#issuecomment-2614296866

https://github.com/llvm/llvm-project/pull/123926