[Rust] How do I query function and module attributes?

I wanted to filter out tests from my results, based on if they either had a #[test] attribute or #[cfg(test)].

Currently tried something similar to this but cant figure out how to properly filter this from the docs

```ql
predicate doesntWork(Module mod, Attr a, Meta m) {
a = mod.getAnAttr() and
m = a.getMeta() and
m.hasPath() and
m.getPath().toString() = "cfg" and
m.hasTokenTree()
}
```

Start by locating the Rust CodeQL library definitions for Module, Attr, and Meta, then compare how the #[test] and #[cfg(test)] attributes are represented. Done means providing a documented query pattern that filters tests using these attributes.

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