feat: Qdrant RAG provider

[Anush008]

Description

This PR adds Qdrant as a RAG provider in Helix.

Testing

I've unit tested the rag_qdrant.go implementation with a local Qdrant instance.

• You can run Qdrant with

docker run -p 6333:6333 -p 6334:6334 qdrant/qdrant

• Set RAG_QDRANT_HOST, RAG_QDRANT_PORT to "localhost" and 6334 respectively.

You can view the vectors at http://localhost:6333/dashboard.

[Anush008]

Hey @lukemarsden.
Just bumping this PR. Please take a look when possible.

[chocobar]

Could you add a rag_qdrant_test.go file? All other RAG providers have test suites (see rag_typesense_test.go for the pattern). The tests use testify/suite and should cover Index, Query, and Delete operations.

[chocobar]

Should the default collection name "helix-documents" and search limit 10 be configurable via RAGSettings rather than hardcoded? Other providers seem to allow collection name configuration?

[Anush008]

Should the default collection name "helix-documents" and search limit 10 be configurable via RAGSettings rather than hardcoded? Other providers seem to allow collection name configuration?

They are configurable.

[Anush008]

Included the test suites that run on a local Qdrant instance.

docker run -p 6333:6333 -p 6334:6334 qdrant/qdrant

You can view the vectors at http://localhost:6333/dashboard.

[Anush008]

Hey @chocobar @lukemarsden
Just bumping this PR. Please review when possible.