Split Role from Identity

[jdsika]

Consider introducing more complex roles

[jdsika]

We may introduce another ENUM to let the ascs change the status of the membership in the contract:

Type
member_registry big_map(address, $member_registry_value)
member_registry_value pair
did address
status $status
issuer string
uuid string
status or
active unit
revoked unit

[jdsika]

The current proposal in the PR is to create membership credentials which are nested in the ascs admin role (credential) and the status of the membership can be changed by disabling the credential in the revocation registry.