get list of supported countries for passports #2403
Description
I am having a similar issue to that of #815, but for passports.
Specifically, I would like to validate passport numbers for all known countries, but for unknown countries I would like to provide my own, simple validation. However, the list of known countries is not programmatically available, so unknown countries are just considered invalid.
As an example, Albania is unknown and so the code simply returns that it is false.