Add JavaScript implementation

[davidjgoss]

🤔 What's changed?

This PR adds a JavaScript implementation of the formatter which passes the same acceptance tests as the Java one and is built with the new plugin-based cucumber-js formatter structure.

🏷️ What kind of change is this?

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

♻️ Anything particular you want feedback on?

See inline comments.

📋 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.

---

This text was originally generated from a template, then edited by hand. You can modify the template here.

[davidjgoss]

Some more stuff needed for this to be merge-ready:

• Add pull request and release actions for CI
• Add README.md
• Add option to override suite name for parity with existing cucumber-js formatter
• Handle scenarios with no steps correctly
• Address mismatch of retry behaviour with Java

[mpkorstanje]

Looks good. Only spotted a few difference between JS and Java. If you need help fixing these in Java let me know.