[clang-tools-extra] [clang-tidy] Add performance-redundant-lookup check (PR #125420)

[Balazs Benics via cfe-commits]

steakhal wrote:

> @steakhal: Please fix documentation and Release Notes wording that I mentioned already.

Thanks, fixed!
I'm actually more curious about the semantic requirements, and about what directions should I explore more.

https://github.com/llvm/llvm-project/pull/125420