[clang-tools-extra] [clang-tidy] Add `llvm-formatv-string` (PR #195974)

[Yanzuo Liu via cfe-commits]

https://github.com/zwuis commented:

> Please add entry to Release Notes.

FYI you can run clang-tools-extra/clang-tidy/add_new_check.py to create a new check.

https://clang.llvm.org/extra/clang-tidy/Contributing.html

https://github.com/llvm/llvm-project/pull/195974