For an abstract class in the CodeQL source code, how can I quickly find all the classes that extend this abstract class from the CodeQL library?

Dear CodeQL Team,

I hope this message finds you well. I have a question regarding efficiently identifying subclasses of an abstract class in the CodeQL source code. Specifically:

For an abstract class in the CodeQL source code, is there a way to quickly find all the classes that extend this abstract class within the CodeQL library?

For example, consider the following class:

```ql
module PathInjection {
abstract class Sanitizer extends DataFlow::Node { }
}
```
Its subclasses are distributed across multiple files. Using search tools, I would have to search for patterns like `extends .*Sanitizer` and `extends .*PathInjection::Sanitizer`, etc., which is very cumbersome.

Thank you in advance for your time and assistance!