1. Make active_crawls into a dict instead of set and remove jobs array. Effective lookup and storage of active crawls and crawl control.
2. Put a lock on active_crawls, so similtanious push and pop by coroutines doesn't cause a race condition
3. Move the depth check logic outside the child link for loop, as source_url doesn't change in the loop.
- Replace validators library with built-in urlparse for URL validation
- Optimize filter statistics update logic for better performance
- Add performance benchmarking suite for filters
- Add execution time tracking to scraper examples
- Update gitignore with windsurfrules
BREAKING CHANGE: Removed dependency on validators library for URL validation
