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!

首先查看 PathInjection 模块中抽象类 Sanitizer 相关的 CodeQL 库源代码和文档。确定该库或其工具是否提供跨文件枚举子类的方法，并记录最快的受支持方案；issue 中未指定具体文件或测试。

由索引模型根据 Issue 内容生成。