:sparkles: [#175] added expand for detail endpoints in redoc

[bart-maykin]

Fixes #175

Changes

Expand queryset params now get generated on detail views.

[bart-maykin]

It seems fine. I am not sure exactly what it is supposed to do. This is the first time I've looked at open klant

Are there tests that can be made for it?

There are tests for the expand feature which was already working fine. The issue is that the expand query param wasn't present for detail calls in the oas file. The 2 endpoints that have the expand queryset feature are:

• klanten-contacten (/klantinteracties/api/v1/schema/#tag/klanten-contacten/operation/klantcontactenRetrieve)
• partijen/ (/klantinteracties/api/v1/schema/#tag/partijen/operation/partijenRetrieve)