[clang] [clang-tools-extra] [clang-tidy][NFC] Expose HeuristicResolver::lookupDependentName() and use it in StandaloneEmptyCheck (PR #128391)

[Congcong Cai via cfe-commits]

https://github.com/HerrCai0907 approved this pull request.

LGTM as temporary solution
But clang-tidy actually do not want to reply on `Sema`. I take a look briefly about `HeuristicResolver`, it looks like not related to other Sema parts.
 Is it possible to move the whole `HeuristicResolver` out of `Sema` lib to `AST`?

https://github.com/llvm/llvm-project/pull/128391