Added support for Offers to directly target whether a user is registered or guest without needing a customer segment
Defined two new reserved values for UserTargets: ANY_GUEST and ANY_REGISTERED to indicate the target is one of those general groups rather than a specific user.
Added friendly label field to UserTarget to store the name of the Customer, Segment, etc. for display to the user instead of the ID, which is a ULID.
The label will fallback to the targetValue if null.