Add Bloom filters to the Cloud SQL PremiumList schema (#306)

* Add Bloom filters to the Cloud SQL PremiumList schema

They are slightly different from the existing Bloom filters stored in Datastore
in that they now use an ASCII String encoding rather than the more generic
CharSequence, and there is no maximum size (whereas we previously had to live
within the 1 MB max entity size for Datastore).

db/src/main/resources/sql/schema/db-schema.sql.generated

@@ -130,6 +130,7 @@
 
     create table "PremiumList" (
        revision_id  bigserial not null,
+        bloom_filter bytea not null,
         creation_timestamp timestamptz not null,
         currency bytea not null,
         name text not null,