feat: Refactor CodeExecutionTool for improved readability and maintainability

feat: Enhance tools with new web content extractor and improved functionality

Refactor speech_to_text.py to implement a singleton ASR pipeline, enhance error handling, and introduce SpeechToTextTool for better integration. Update spreadsheet_tool.py to support querying and improve parsing functionality, including CSV support. Enhance video_processing_tool.py with new tasks for metadata extraction and frame extraction, while improving object detection capabilities and initialization checks.

refactor: update tool classes to inherit from Tool base class for consistency and improved structure

add smolagents docstrings

fix: enhance output handling and add comprehensive tests for code execution tool

feat: implement CodeExecutionTool for safe code execution and output extraction