Add IntervalDescriptor and change DurationConverter to use Interval datatype (#653)

* Add use of interval data type

* Add support for Millis

* Use Java-object type

* Change column type for relock_duration

* add years and months

* Add tests for hours, minutes, and seconds

* Add javadoc describing how joda duration is stored

* Add test for lots of days

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

@@ -459,7 +459,7 @@ create sequence history_id_sequence start 1 increment 1;
         lock_request_timestamp timestamptz not null,
         registrar_id text not null,
         registrar_poc_id text,
-        relock_duration int8,
+        relock_duration interval,
         repo_id text not null,
         unlock_completion_timestamp timestamptz,
         unlock_request_timestamp timestamptz,

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

@@ -670,7 +670,7 @@ CREATE TABLE public."RegistryLock" (
     unlock_completion_timestamp timestamp with time zone,
     last_update_timestamp timestamp with time zone,
     relock_revision_id bigint,
-    relock_duration bigint
+    relock_duration interval
 );