Update execution counts and serialize episodes to JSONL format in redis_stats.ipynb

[XuhuiZhou]

Closes #56

📑 Description

✅ Checks

• [ ] My pull request adheres to the code style of this project
• [ ] My code requires changes to the documentation
• [ ] I have updated the documentation as required
• [ ] All the tests have passed
• [ ] Branch name follows type/descript (e.g. feature/add-llm-agents)
• [ ] Ready for code review

ℹ Additional Information

[lwaekfjlk]

Hi @XuhuiZhou , I split serialization and easier demo of stats in #63. Please check.