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

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

> 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`?

In future enhancements to `HeuristicResolver`, I would like to implement optional heuristics that make use of `Sema`. I envisioned the dependency on `Sema` being optional, such that clients who do have have one can continue to construct a `HeursiticResolver` without passing in a `Sema`.

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