ambiguous step def detection akin to cucumber jvm

[Johnlon]

Addresses #635

🤔 What's changed?

As discussed on related issue this change adds a behaviour under 'strict' mode to detect ambiguous step definitions.
As per cuke jvm this change also adds the "ambiguous" status to godog which appears in the relevant reports; pretty/json.

⚡️ What's your motivation?

Detection of ambiguous steps is a feature of cucumber and behave but missing from godog.

🏷️ What kind of change is this?

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

This change is only affective under strict mode.

♻️ 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

Attention: Patch coverage is 93.61702% with 3 lines in your changes missing coverage. Please review.

Project coverage is 80.27%. Comparing base (153db4e) to head (a6f9c2e).
Report is 12 commits behind head on main.

Files	Patch %	Lines
suite.go	91.89%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #636      +/-   ##
==========================================
- Coverage   83.21%   80.27%   -2.94%     
==========================================
  Files          28       40      +12     
  Lines        3413     3149     -264     
==========================================
- Hits         2840     2528     -312     
- Misses        458      502      +44     
- Partials      115      119       +4     

☔ View full report in Codecov by Sentry.
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[Johnlon]

Is there any documentaton for godog to update on this change?

[Johnlon]

BTW the coverage results seem quite bogus to me - same on the last PR I made. It reports low coverage on commits from previous work not part of this change.