Italian section: monumental trees

Based on government data:
https://www.politicheagricole.it/flex/cm/pages/ServeBLOB.php/L/IT/IDPagina/11260

Italy has 2407 monumental trees or group of trees. This can't be checked against natural=tree since group of trees are also listed, and some groups count up to +60 trees. It could be checked directly with https://wiki.openstreetmap.org/wiki/IT:Key:ref:masaf