Confuse `Country` API

[Tristan-WorkGH]

The com.powsybl.iidm.network.Country define a name field for the name of the country with a getter getName().

But as it is an Enum, it already have a name attribute accessible with methods name() and toString() which confuse me and I found error prone when using the API.

What do you think of using a more explicit or distinct attribute name like "countryName"?