Configure IDN variant TLDs as Zones

[pcarana]

Migrated from NICMx/rdap-server#54 (courtesy of @TheRedTrainer):

Should rdap-server allow to configure an IDN variant TLD as a zone?

I think that it would be useful to allow to configure any kind of TLD as a zone. The current configuration.properties and db table (rdap.zone) allow to configure only one name/representation per zone (for example .com, .lat, .mx).

If you want to configure a TLD that includes a unicode char (for example eú) as a zone in db and configuration.properties, the server allows to configure only the u-label (eú) and query a domain including that unicode char, but there is no column in db or any property to configure the corresponding ldh name.

[pcarana]

This issue is out of scope of milestone 1.2.0, labeled as enhancement.