feat: Enhance AsyncPlaywrightCrawlerStrategy with text-only and light modes, dynamic viewport adjustment, and session management

### New Features:
- **Text-Only Mode**: Added support for text-only crawling by disabling images, JavaScript, GPU, and other non-essential features.
- **Light Mode**: Optimized browser settings to reduce resource usage and improve efficiency during crawling.
- **Dynamic Viewport Adjustment**: Automatically adjusts viewport dimensions based on content size, ensuring accurate rendering and scaling.
- **Full Page Scanning**: Introduced a feature to scroll and capture dynamic content for pages with infinite scroll or lazy-loading elements.
- **Session Management**: Added `create_session` method for creating and managing browser sessions with unique IDs.

### Improvements:
- Unified viewport handling across contexts by dynamically setting dimensions using `self.viewport_width` and `self.viewport_height`.
- Enhanced logging and error handling for viewport adjustments, page scanning, and content evaluation.
- Reduced resource usage with additional browser flags for both `light_mode` and `text_only` configurations.
- Improved handling of cookies, headers, and proxies in session creation.

### Refactoring:
- Removed hardcoded viewport dimensions and replaced them with dynamic configurations.
- Cleaned up unused and commented-out code for better readability and maintainability.
- Introduced defaults for frequently used parameters like `delay_before_return_html`.

### Fixes:
- Resolved potential inconsistencies in viewport handling.
- Improved robustness of content loading and dynamic adjustments to avoid failures and timeouts.

### Docs Update:
- Updated schema usage in `quickstart_async.py` example:
  - Changed `OpenAIModelFee.schema()` to `OpenAIModelFee.model_json_schema()` for compatibility.
- Enhanced LLM extraction instruction documentation.

This commit introduces significant enhancements to improve efficiency, flexibility, and reliability of the crawler strategy.

mkdocs.yml

@@ -12,7 +12,7 @@ nav:
   - 'Quick Start': 'basic/quickstart.md'
   - Changelog & Blog:
     - 'Blog Home': 'blog/index.md'
-    - 'Latest (0.4.0)': 'blog/releases/0.4.0.md'
+    - 'Latest (0.4.1)': 'blog/releases/0.4.1.md'
     - 'Changelog': 'https://github.com/unclecode/crawl4ai/blob/main/CHANGELOG.md'
 
   - Basic: