[clang-tools-extra] [clang-tidy] support query based custom check (PR #131804)

[Baranov Victor via cfe-commits]

https://github.com/vbvictor commented:

Mostly docs suggestions. I like this approach with config file, but don't have a strong opinion for now, so LGTM without explicit approval.

https://github.com/llvm/llvm-project/pull/131804