feat(v0.3.6): Add screenshot capture, delayed content, and custom timeouts

- Implement screenshot capture functionality
- Add delayed content retrieval method
- Introduce custom page timeout parameter
- Enhance LLM support with multiple providers
- Improve database schema auto-updates
- Optimize image processing in WebScrappingStrategy
- Update error handling and logging
- Expand examples in quickstart_async.py

crawl4ai/async_webcrawler.py

@@ -202,11 +202,11 @@ class AsyncWebCrawler:
                 )
 
             if result is None:
-                raise ValueError(f"Failed to extract content from the website: {url}")
+                raise ValueError(f"Process HTML, Failed to extract content from the website: {url}")
         except InvalidCSSSelectorError as e:
             raise ValueError(str(e))
         except Exception as e:
-            raise ValueError(f"Failed to extract content from the website: {url}, error: {str(e)}")
+            raise ValueError(f"Process HTML, Failed to extract content from the website: {url}, error: {str(e)}")
 
         cleaned_html = sanitize_input_encode(result.get("cleaned_html", ""))
         markdown = sanitize_input_encode(result.get("markdown", ""))