Improve creating ISO 4217 currency

[bjarnef]

Is your feature request related to a problem? Please describe.
Currently it is simple enough to create a currency. However when working with a wide range of payment gateway, it is pretty common to use ISO 4217 currency codes.

Describe the solution you'd like
Could we either have a new "create" menu action to create a ISO 4217 similar to these when creating a country:

or maybe some auto complete when entering in ISO code input?

We already have a Iso4217 class with a property CurrencyCodes containing all these currency codes, so it should be simply enough to have an endpoint returning these. But maybe there are currency codes not following this standard, so it would be great still to have full control.