Adding OBS_DumpVersion function

server/extension/sql/130_data_observatory_helper.sql

@@ -0,0 +1,5 @@
+CREATE OR REPLACE FUNCTION cdb_dataservices_server.obs_dumpversion(username text, orgname text)
+RETURNS text AS $$
+  CONNECT cdb_dataservices_server._obs_server_conn_str(username, orgname);
+  SELECT cdb_observatory.obs_dumpversion();
+$$ LANGUAGE plproxy;