Fix: objectId size for Pointer in Postgres (#6619)

* Fixing objectId for Pointer in Postgres

* add test case for longer objectId pointer. Note that this test fails on Postgres before the addition of previous commit

* removed comment that wasn't needed

src/Adapters/Storage/Postgres/PostgresStorageAdapter.js

@@ -37,7 +37,7 @@ const parseTypeToPostgresType = (type) => {
     case 'Boolean':
       return 'boolean';
     case 'Pointer':
-      return 'char(10)';
+      return 'text';
     case 'Number':
       return 'double precision';
     case 'GeoPoint':