Add the SourceReference in ParameterType

[jkronegg]

🤔 What's the problem you're trying to solve?

When implementing a Java plugin, I can determine the source reference of a Step Definition (using handler on Envelope.stepDefinition), but I cannot determine the source reference for a ParameterType.

✨ What's your proposed solution?

Add a SourceReference in the io.cucumber.messages.types.ParameterType.

⛏ Have you considered any alternatives or workarounds?

The ParameterType can be obtained outside Cucumber by looking at all methods annotated @ParameterType on all classes of the classpath, but this is not really efficient.

📚 Any additional context?

Feature request to implement this new API change:

• Java: Add source reference on Envelope.parameterType cucumber-jvm#2719
• Ruby: Add source reference on Envelope.parameterType cucumber-ruby#1702
• JS: Add source reference on Envelope.parameterType cucumber-js#2272

[mpkorstanje]

@jkronegg if you hadn't found it already, the CONTRIBUTING.md describes how to add to the messages.