feat: Qdrant support

[Anush008]

This PR intends to add Qdrant as a supported vector database.

The database to be used can be configured using the new vectorstore.database property. The default values are set, ensuring no breaking change in the current behaviour.

[imartinez]

Amazing PR. Thanks for the clarity, the configurability and the detail to documentation.

I tried it as QdrantLocal and works perfect (faster than Chromadb at around x2 in my first tests).

As a piece of unrelated feedback (definitely not to be fixed in the scope of this PR, but it will affect people adoption of qdrant), the configuration of QdrantClient is a little misleading as can be seen in the actual implementation of it:

 if location == ":memory:":
            self._client = QdrantLocal(location=location)
        else:
            if path is not None:
                self._client = QdrantLocal(location=path)
            else:
                if location is not None and url is None:
                    url = location
                self._client = QdrantRemote(

It is hard to understand how to configure it for local usage vs remote vs on memory.

Again, thanks a lot for the integration!