🤔 What's changed?

In order to implement suggestions for an undefined step, consumers will need access to the full PickleStep, including the keyword type, text, and doc string or data table argument. This PR exposes it publicly in the UndefinedError.

It also adds a new method getExpressionGenerator() to the SupportCodeLibrary which can then be used to generate possible expressions for a pickle step text.

🏷️ What kind of change is this?

• ⚡ New feature (non-breaking change which adds new behaviour)

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

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