Implement async support in Qdrant local mode (#8001)

I've extended the support of async API to local Qdrant mode. It is faked
but allows prototyping without spinning a container. The tests are
improved to test the in-memory case as well.

@baskaryan @rlancemartin @eyurtsev @agola11

docs/extras/modules/data_connection/retrievers/how_to/self_query/qdrant_self_query.ipynb

@@ -114,7 +114,6 @@
     "            \"rating\": 9.9,\n",
     "            \"director\": \"Andrei Tarkovsky\",\n",
     "            \"genre\": \"science fiction\",\n",
-    "            \"rating\": 9.9,\n",
     "        },\n",
     "    ),\n",
     "]\n",