Move the RAG part with Qdrant to using the Quarkus Langchain4J extension

[zbendhiba]

Use the new Qrant extension instead of the qdrant langchain4j dependency, for the RAG part.

Make the environment smooth to start the Qdrant automatically with Dev services in developer mode.

[zbendhiba]

I tried it out before it was released. It worked fine for development mode, see the latest demo from last week, that uses the new extension with devservices. https://github.com/zbendhiba/quarkus-langchain-demo/tree/qdrant

I did have an issue running without dev services, but I did changed a lot the code, it maybe totally unrelated.

[orpiske]

@zbendhiba There's something I've been thinking about/planning which is not directly related to this, but may be relevant for this task ...

I have been reading about the implementation of complex RAG systems and there are some things we should consider:

• Knowledge graphs for addressing relationships between topics
• Query augmentation for addressing the problem with badly phrased questions
• Query planning for - if I understand it correctly - answering complex questions from a set of simpler ones.

It's not clear to me yet how to address these, but knowing that this is something we (maybe others too?) would need to do could help shape that.