vector search endpoint (#1827)

* adding initial vector search view

* adding working vector results endpoint

* regenerate openapi spec

* fixing format of returned results

* adding test

* patching qdrant client

* moving to v0 api

* switch to custom serializer for vector search

* fix v0 url

* using minimal serializer

* returning minimal response for vector results

* regenerate spec

* adding some other useful bits to response

* fixing response for empty query and adjusting test

* regenerate spec

* uninheriting from searchrequest serializer

* updating oai spec

* updating oai spec

Author: shanbady