[Feature]: Add support for Mistral AI

### Class | 类型

大语言模型

### Feature Request | 功能请求

As title suggests, is it possible to add support for LLM models from [Mistral AI](mistral.ai) such as Mistral Nemo and Mistral Large 2?

Thanks for the great work, devs!

Start by surveying the repository's existing integrations for supported large language models and identify the entry points used to configure and call them. Compare the requested Mistral Nemo and Mistral Large 2 support with those integrations; done means both models can be selected and used consistently with the project's existing interface.

Written by the indexing model from the issue text.