Enhance AsyncWebCrawler with smart waiting and screenshot capabilities

- Implement smart_wait function in AsyncPlaywrightCrawlerStrategy
- Add screenshot support to AsyncCrawlResponse and AsyncWebCrawler
- Improve error handling and timeout management in crawling process
- Fix typo in CrawlResult model (responser_headers -> response_headers)
- Update .gitignore to exclude additional files
- Adjust import path in test_basic_crawling.py

tests/async/test_basic_crawling.py

@@ -5,7 +5,7 @@ import asyncio
 import time
 
 # Add the parent directory to the Python path
-parent_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+parent_dir = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 sys.path.append(parent_dir)
 
 from crawl4ai.async_webcrawler import AsyncWebCrawler