🤔 What's changed?

• Add sourceReference to test cases and test steps in the plan - these can be used to enhance stack traces in Cucumber implementations by providing frames that reference the step and/or scenario that was being executed.
• Rename AssembledStep to AssembledTestStep for clarity and consistency

🏷️ What kind of change is this?

• ⚡ New feature (non-breaking change which adds new behaviour)
• 💥 Breaking change (incompatible changes to the API)

📋 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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