LanceDB Vector store node

[jclaveau]

Presently we can use Redis, Pg, Milvus, Pinocone... as vector db which all require a third-party service to run.

LanceDB is an open source vector db stored in a local file and already supported by LangChain.

The SQLite of vector dbs in a nutshell

Having a node to use it for embeddings would allow Flowise to run a lot of flows requiring just a docker volume and no other service

I may find the time to implement it if it gets some traction