[clang] [clang-tools-extra] [clang-tidy] Add support for bsl::optional (PR #101450)

[Nicolas van Kempen via cfe-commits]

https://github.com/nicovank approved this pull request.

LGTM. Rebase to fix release notes conflict and I'll merge 👍 

https://github.com/llvm/llvm-project/pull/101450