🤔 What's changed?

• For Scenario Outlines, provides support to mark steps without matching step definitions as undefined

⚡️ What's your motivation?

• Closes Diagnostics support for undefined steps in scenario outlines #149
• Closes Highlight undefined steps in Scenario Outlines vscode#90
• Closes Outline scenarios with examples are not working as expected monaco#60

Most requested functionality, with present behaviour providing an incorrect impression that all steps in Scenario Outlines are defined - as diagnostics are disabled with Scenario Outlines.

🏷️ What kind of change is this?

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

♻️ Anything particular you want feedback on?

📋 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.
• 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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