Qdrant: how to make a "group_by" search

[lambda-science]

Is your feature request related to a problem? Please describe.
In Qdrant it is possible to make a group_by search (https://qdrant.tech/documentation/concepts/search/#search-groups)
This means that instead of search a collections of documents, we can limit and say for each documents, retrieve a maximum of X chunks, which can be very usefull for more diverse retrieving in the case of RAG.
This question is more generally, about the possibility of passing a custom query kwargs to the Qdrant retriever/query API through Haystack.

Describe the solution you'd like
Maybe add a qdrant_query_kwargs to the Qdrant Retriever to pass specific parameters to the query method of Qdrant ?

Describe alternatives you've considered
Implementing a new query/run method inheriting from base HybridRetriever to change the behaviour of the component.

Additional context
@Anush008 might have insight on this

[lambda-science]

Idea: maybe it could be cool to have a way to write our own queries instead of relying on the way they are implemented in the document store (_query_by_embedding, _query_hybrid, _query_by_sparse...

I guess right now to do this you need to Inherit from documentstore, to add your custom query method and then create a new retriever that use it.

This could allow to use the powerfull Query feature of Qdrant more reasily from Haystack.

[lambda-science]

It's P3 but I did a PR instead @julian-risch :) #1054