Draft - Cucumber Message Format

[Johnlon]

🤔 What's changed?

Draft providing Cucumber Messages support - work in progress.

• ⚡ 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.
• 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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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.69%. Comparing base (153db4e) to head (c611755).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #627      +/-   ##
==========================================
- Coverage   83.21%   79.69%   -3.52%     
==========================================
  Files          28       40      +12     
  Lines        3413     3113     -300     
==========================================
- Hits         2840     2481     -359     
- Misses        458      513      +55     
- Partials      115      119       +4     

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