Add entity for reserved list (#381)

This PR added the Cloud SQL entity for reserved list.

db/src/main/resources/sql/flyway/V10__create_reserved_list_and_entry.sql

@@ -0,0 +1,36 @@
+-- Copyright 2019 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 table "ReservedEntry" (
+       revision_id int8 not null,
+        comment text,
+        reservation_type int4 not null,
+        domain_label text not null,
+        primary key (revision_id, domain_label)
+    );
+
+    create table "ReservedList" (
+       revision_id  bigserial not null,
+        creation_timestamp timestamptz not null,
+        name text not null,
+        should_publish boolean not null,
+        primary key (revision_id)
+    );
+
+create index reservedlist_name_idx on "ReservedList" (name);
+
+    alter table if exists "ReservedEntry"
+       add constraint FKgq03rk0bt1hb915dnyvd3vnfc
+       foreign key (revision_id)
+       references "ReservedList";