[Enhancement Request] Add LangChain

[timelord1102]

Describe the Enhancement

Llama 2 is a very powerful LLM that also happens to be free and open source. It would make a very good backend for the generative features. Other alternatives good alternatives could be OpenLlama or GPT4All

Describe the current behavior

AI isnt real

Describe alternatives to your enhancement

No response

Screenshots

No response

Additional Context

No response

[LeadFreeCandy]

We're likely going to use https://www.langchain.com which should ideally let us do exactly that!