[#707] Track delegate registration in interpreter

Discussion point: Does it make sense to add a transfer failure predicate for "delegate unregistered"?

Description

Problem: Address status as registered delegate is ignored in the interpreter

Solution: Track registration status and fail when trying to set contract's delegate to an address not registered as delegate.

Handle this error as TransferFailure in Cleveland

Handle unregistered_delegate in morley-client.

Related issue(s)

Resolves #707 (closed)

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