Add useFilteredTestCases hook

[davidjgoss]

🤔 What's changed?

Adds a useFilteredTestCases hook for getting test case data for a truly test case-centric view (e.g. the timeline in #524) which still honours status/tag/search criteria.

Much of this has been factored out from the existing useFilteredDocuments hook, in particular the code that deals with creating and managing the text search index, which is now nicely abstracted away.

🏷️ 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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