[Suggestion] Adding xAI Grok support, or documentation

[jonjosko]

Hello! I wanted to suggest adding xAI's Grok model to the list of available Chatbots. According to their documentation, the query should follow OpenAI and Anthropic's conventions closely.

I've tried tweaking the chat_openai() and chat_claude() functions to handle Grok, but I can't seem to get past a "req_perform_connection()" error on my end.

Thanks for this package!