chore: support adjustment intervals for subscriptions (#23)

Author: ecktoteckto

db/migrations/0005_subscription_adjustment_intervals.sql

@@ -0,0 +1 @@
+alter table orb.subscriptions add adjustment_intervals JSONB;

packages/orb-sync-lib/src/schemas/subscription.ts

@@ -28,6 +28,7 @@ export const subscriptionSchema: JsonSchema = {
     start_date: { type: 'string' },
     status: { type: 'string' },
     trial_info: { type: 'object' },
+    adjustment_intervals: { type: 'object' },
   },
   required: ['id'],
 } as const;