refactor(notebooks)🔧: Remove agents.ipynb and refactor agents.py to improve agent setup and benchmarking

- Delete the Jupyter notebook agents.ipynb to clean up obsolete example code.
- Refactor agents.py to enhance imports, add logging, and enable debug mode for llamabot.
- Add new tools and metrics for agent performance measurement including iteration count, duration, tool usage, and message counts.
- Introduce a planner bot for complex task decomposition and integrate it into the agent setup.
- Implement an experiment to benchmark different models with the AgentBot on a weather query task.
- Update agent test cells to print responses for tech events, data analysis, sports, and historical queries.

Author: ericmjl