Alt entity model for fast JPA bulk query (#1398)

* Alt entity model for fast JPA bulk query

Defined an alternative JPA entity model that allows fast bulk loading of
multi-level entities, DomainBase and DomainHistory. The idea is to bulk
the base table as well as the child tables separately, and assemble them
into the target entity in memory in a pipeline.

For DomainBase:

- Defined a DomainBaseLite class that models the "Domain" table only.

- Defined a DomainHost class that models the "DomainHost" table
  (nsHosts field).

- Exposed ID fields in GracePeriod so that they can be mapped to domains
  after being loaded into memory.

For DomainHistory:

- Defined a DomainHistoryLite class that models the "DomainHistory"
  table only.

- Defined a DomainHistoryHost class that models its namesake table.

- Exposed ID fields in GracePeriodHistory and DomainDsDataHistory
  classes so that they can be mapped to DomainHistory after being
  loaded into memory.

In PersistenceModule, provisioned a JpaTransactionManager that uses
the alternative entity model.

Also added a pipeline option that specifies which JpaTransactionManager
to use in a pipeline.

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

@@ -412,12 +412,12 @@
 
     create table "DomainTransactionRecord" (
        id  bigserial not null,
+        domain_repo_id text,
+        history_revision_id int8,
         report_amount int4 not null,
         report_field text not null,
         reporting_time timestamptz not null,
         tld text not null,
-        domain_repo_id text,
-        history_revision_id int8,
         primary key (id)
     );