refactor(scraper): optimize URL validation and filter performance

- 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

docs/scraper/scraper_quickstart.py

@@ -8,6 +8,7 @@ from crawl4ai.scraper import (
 )
 from crawl4ai.async_webcrawler import AsyncWebCrawler, BrowserConfig
 import re
+import time
 
 browser_config = BrowserConfig(headless=True, viewport_width=800, viewport_height=600)
 
@@ -55,6 +56,7 @@ async def basic_scraper_example():
 
 # advanced_scraper_example.py
 import logging
+
 from crawl4ai.scraper import (
     AsyncWebScraper,
     BFSScraperStrategy,
@@ -177,11 +179,15 @@ async def advanced_scraper_example():
 
 if __name__ == "__main__":
     import asyncio
+    import time
 
     # Run basic example
+    start_time = time.perf_counter()
     print("Running basic scraper example...")
     asyncio.run(basic_scraper_example())
+    end_time = time.perf_counter()
+    print(f"Basic scraper example completed in {end_time - start_time:.2f} seconds")
 
-    # Run advanced example
-    print("\nRunning advanced scraper example...")
-    asyncio.run(advanced_scraper_example())
+    # # Run advanced example
+    # print("\nRunning advanced scraper example...")
+    # asyncio.run(advanced_scraper_example())