feat: Qdrant Vector Search

[Anush008]

Description

This PR adds support for using Qdrant as a vector search provider in Manifold.

Today, I've unit tested the qdrant_vector.go implementation with a local Qdrant instance.

You can run Qdrant with

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

Then use "http://localhost:6334" as the DSN.
You can view the vectors at http://localhost:6333/dashboard.