Add MapUserType to support converstion between Map and hstore (#443)

db/src/main/resources/sql/flyway/V14__load_extension_for_hstore.sql

@@ -0,0 +1,15 @@
+-- Copyright 2020 The Nomulus Authors. All Rights Reserved.
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+CREATE EXTENSION IF NOT EXISTS hstore WITH SCHEMA public;

db/src/main/resources/sql/schema/nomulus.golden.sql

@@ -16,6 +16,20 @@ SET xmloption = content;
 SET client_min_messages = warning;
 SET row_security = off;
 
+--
+-- Name: hstore; Type: EXTENSION; Schema: -; Owner: -
+--
+
+CREATE EXTENSION IF NOT EXISTS hstore WITH SCHEMA public;
+
+
+--
+-- Name: EXTENSION hstore; Type: COMMENT; Schema: -; Owner: -
+--
+
+COMMENT ON EXTENSION hstore IS 'data type for storing sets of (key, value) pairs';
+
+
 SET default_tablespace = '';
 
 SET default_with_oids = false;