Create llama-index `InfinityEmbeddings` as langchain

Hi! Kudos for this project Michael! It is amazing.

We're migrating from a single repo with a RAG and and T40, to one repo with a RAG with just cpu and and another service with our embeddings models, rerankers... and just start/stop this machine (which is expensive) when traffic arrives.

We have seen your tool and looks promising, and we're willing to contribute.

Did you consider support llama-index? I think we (my company) could work on the llama-index integration, we can ping you when it's done to review.

What do you think?

The issue proposes a llama-index integration but identifies no files, tests, entry point, or acceptance criteria. Start by reviewing Infinity’s serving interface and the llama-index integration requirements, then confirm scope with maintainers; done would require an agreed, reviewable integration and appropriate tests.

Written by the indexing model from the issue text.