Key resolution for status list

[c2bo]

Section 7.1. defines supported key resolution mechanisms to validate issued credentials. We do not define a mechanism to validate the status list with currently.

Imho, we should re-use the same key resolution mechanism that is used by the issuer - makes things easier to manage and implement. If people agree with this, I will create a PR to add a small text stating to re-use the same mechanism for status list validation.