`feat`
- [provide api key pool](https://github.com/Undertone0809/promptulate/commit/e4a582b0a10019b8c981b407d9791d49643b912b)
- [add duckduckgo search tool](https://github.com/Undertone0809/promptulate/commit/e52dea5b549672ea7ac1f5c7dcbedc01b0c6cc2d)
- [add python repl tool](https://github.com/Undertone0809/promptulate/commit/7c185cb1f109b0650738d18c6ae16500c0565c8c)
- [add arxiv tool](https://github.com/Undertone0809/promptulate/commit/77a8c3e389c2f4b8572f76fc2f64b38189cc5d9f)