Implement a function that takes a [KDL query](https://github.com/kdl-org/kdl/blob/main/QUERY-SPEC.md) as a string and a KDL Document and returns the result of executing the query on the document.
Implement a function that takes a KDL query as a string and a KDL Document and returns the result of executing the query on the document.