Add a SQL schema to AllocationToken (#763)

* Add a SQL schema to AllocationToken

* Respond to CR

- rename field in tests
- rename allowed_registrar_ids field
- remove unnecessary db load in GATC

* Add TODO for HistoryEntry vkeys

* Run autoformat

* V48 -> V49

db/src/main/resources/sql/flyway/V49__create_allocation_token.sql

@@ -0,0 +1,31 @@
+-- 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 TABLE "AllocationToken" (
+   token text NOT NULL,
+    update_timestamp timestamptz,
+    allowed_registrar_ids text[],
+    allowed_tlds text[],
+    creation_time timestamptz NOT NULL,
+    discount_fraction float8 NOT NULL,
+    discount_premiums boolean NOT NULL,
+    discount_years int4 NOT NULL,
+    domain_name text,
+    redemption_history_entry text,
+    token_status_transitions hstore,
+    token_type text,
+    PRIMARY KEY (token)
+);
+
+CREATE INDEX allocation_token_domain_name_idx ON "AllocationToken" (domain_name);