Refactor search context

[davidjgoss]

🤔 What's changed?

The functionality supporting search, having been gradually extended over time, was a bit confusing to work with for both consumers and maintainers. This rework aims to reduce the amount and complexity of code involved, and make it easier for consumers to add search to their app either out of the box or with custom handling.

Specifically:

• Naming is clearer
• Implementation details that should stay internal - like the React context - are not exported
• <ControlledSearchProvider/> provides a low-level usage with value and onChange allowing you to manage the state yourself - this will be helpful for consumers integrating with framework-specific routers, or other kinds of state management
• <InMemorySearchProvider/> is a thin useState wrapper around the former - fine for many use cases
• <UrlSearchProvider/> also wraps the controlled one and syncs with query parameters on the URL
• useSearch continues to be the way you consume/update the context, and this is dogfooded in our own components

🏷️ What kind of change is this?

• 🏦 Refactoring/debt/DX (improvement to code design, tooling, etc. without changing behaviour)
• 💥 Breaking change (incompatible changes to the API)

📋 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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