New user/issuer task - Provide Claim

[RieksJ]

Requirement: issuers MUST be able to (sovereignly, autonomously) determine what kinds of claims they will issue to what holders, under what conditions this is done, and specify constraints regarding the contents of the claims they issue to such holders.

Motivation: there are many real-world situations in which this requirement applies, and we need to be able to mimic this for claims as well. For example,

• a government will only issue citizen claims to citizens;
• a ticket that provides entry to an event is only issued after payment is received;
• the contents of an identity claim (e.g., provided to a citizen), will only contain data about that citizen, and/or family in the first degree