Filter /fixtures by sportsbook or Copilot Version ID.

To surface fixtures that are more relevant to customer's use cases we have added 2 new query parameters to the /fixtures and /fixtures/active endpoint.

• sportsbook: You can now pass an optional sportsbook, which will limit the fixtures returned to the ones that have had or currently have odds. Note that if all odds for a fixture are suspended, the fixture will still be returned.
• copilot_version_id: If you are a Copilot customer, you can now limit the fixtures being returned to only include the ones that have had or currently have odds for the version_id you pass to the request.