Anthropic Query Model

[mikrl]

As you can see in llm/models/queries.py there is a query object for OpenAI.

I want to support more LLM providers, and it makes sense to start with Anthropic's chatbot.

https://docs.anthropic.com/claude/reference/getting-started-with-the-api

Definition of Done:

• A Django model is created to store an Anthropic chat query using the existing API key and Prompt template models.
• The query runs against Anthropic using langchain and gets a response.
• A play-by-play in the style of https://github.com/mikrl/django-llm#run-chatgpt-queries-through-django-shell-and-model-code is added to the README demonstrating how to use it.

Not in scope

Refactoring the existing query object

This needs to be done eventually, but I want both OpenAIChatQuery and the Anthropic model to exist before that happens. Maybe even one more model for another service.
Don't worry about code repetition for now since this is an exploration before refactoring to see commonalities, gotchas etc