feat: Implement Cloudflare Analytics Engine integration

- Added API client for interacting with Cloudflare Analytics Engine, including methods for fetching datasets, dataset schemas, and executing SQL queries.
- Created hooks for managing API configuration status, fetching datasets, and executing queries with caching support.
- Updated mock data sources and query results to reflect new dataset structure and statistics.
- Introduced SQL reference documentation for aggregate, date/time, string, mathematical, conditional, type conversion, bit, and encoding functions.
- Enhanced worker routes for health checks, dataset listing, schema retrieval, and query execution with error handling.
- Added support for time range filters in dashboard types.