The different message types in cucumber-messages have references to each other
using id fields. It's a bit similar to rows in a relational database, with
primary and foreign keys.
Consumers of these messages may want to query the messages for certain information. For example, @cucumber/react-components needs to know the status of a Step as it is rendering the GherkinDocument
The Query library makes this easy by providing a function to look up the status of a step, a scenario or an entire file.