java: Implement TestNG XML formatter

[mpkorstanje]

🤔 What's changed?

Implement a message based TestNG formatter.

⚡️ What's your motivation?

Replace the event based TestNG formatter from Cucumber JVM with a message based one.

🏷️ What kind of change is this?

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

📋 Checklist:

• All dependencies have been merged and released
  • java: Implement Query object query#39
• 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.