Reimplement filtering, rework testing

[davidjgoss]

🤔 What's changed?

Now that the query library is more fleshed out, we can reimplement some of the filtering and statistics logic with it. This simplifies things quite a bit.

While we're here, there's also an overdue rework of testing:

• As the compatibility kit is now so much more comprehensive, we can use existing samples for most tests, and remove the tests with test data copied from Gherkin which had become superfluous
• The custom test-utils file wasn't justifying existence any more - we're now importing testing-library stuff directly in tests and wrapping them with providers where needed
• No more dependencies on fake-cucumber (deprecated) or gherkin-streams

🏷️ What kind of change is this?

• 🏦 Refactoring/debt/DX (improvement to code design, tooling, etc. without changing behaviour)

📋 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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