Introduce model, formatting and parsing for Italy.

[norgevz]

Model created by the exploration run: https://docs.google.com/document/d/124OuDTmbv6wsmbeSDq3F-v1eCcyc76UGuzQKFqOKE28/edit?tab=t.0

For formatting expressions, we've considered:

• https://mominitaly.com/italian-address-format/
• https://www.eurosender.com/en/info/address-details/italy
• https://ling-app.com/it/how-to-read-italian-addresses/