Add support for missing "requirements" (cardReader)

[PeterOrneholm]

Is your feature request related to a problem? Please describe. BankID has added a requirement that we don't implement at the moment. A complete list can be found here: https://www.bankid.com/utvecklare/guider/teknisk-integrationsguide/graenssnittsbeskrivning/krav

We are missing:

• cardReader (class1 or class2 defaults to class1)

The addition of this was never mentioned in the version history of the RP guidelines, that's probably why we missed it.

What area is it related to

• API
• Core

Describe the solution you'd like Implement this field in the API and allow them to be set when registering BankID.

• cardReader could be implemented using a enum

[PeterOrneholm]

issuserCn was removed from V6 so we should not implement that, I've updated the issue to reflect this.