Integration with PALM2

[Cormanz]

Recently, Google's PALM2 model has proven to be a ready competitor to OpenAI's GPT4. For further testing, we should try to integrate it with SmartGPT, but no Rust API for the model exists, which makes this more difficult.

We should try to see if we can integrate with PALM2 using the REST API if possible.

[philip06]

In progress already in: https://github.com/Cormanz/smartgpt/pull/44