Improve Money property type precision to give ability to store cryptocurrency values

[joeberetta]

As said in the docs

A money field with a currency. Money properties can have up to 2 digits after coma.

While it’s ok w/ fiat currencies (eur/usd/etc) is not the best choice for crypto monetary system
Cuz e.g. Bitcoin (BTC) has up to 8 digits after comma

[brunobuddy]

@joeberetta sounds fun !