[clang-tools-extra] [clang-tidy] add new check: modernize-use-scoped-lock (PR #126434)

[Baranov Victor via cfe-commits]

vbvictor wrote:

Rebased + ping @PiotrZSL.
I'd merge it at the end of the month if there would be no more reviews.

https://github.com/llvm/llvm-project/pull/126434