[Perl] Prefer the longest step keyword

[ehuelsmann]

🤔 What's changed?

Address the issue reported in #400 (Gherkin should prefer the longest prefix match on step keywords).

⚡️ What's your motivation?

Advance all Gherkin implementations at the same time, including Perl.

🏷️ What kind of change is this?

• 🐛 Bug fix (non-breaking change which fixes a defect)

♻️ Anything particular you want feedback on?

N/A

📋 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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[mpkorstanje]

There are more commits than I would expect in this pull request.

[ehuelsmann]

There are more commits than I would expect in this pull request.

I started out with fix/prefer-longest-step-keyword; originally there was only 1 commit (starting from "main"), but when I rebased, the extra commits came in. I'll be happy to put it back on "main" if that's the better option. I'll also address the performance review remark.

[mpkorstanje]

I started out with fix/prefer-longest-step-keyword; originally there was only 1 commit (starting from "main"), but when I rebased, the extra commits came in. I'll be happy to put it back on "main" if that's the better option. I'll also address the performance review remark.

Cheers!

The test data will be merged separately. Otherwise the build will fail for all implementations.