KERI event stream - detail events and DID Document for cooperative delegation

[2byrds]

From our 2023 August 31 meeting, Sam discussed:
This is a core concept/feature of identity and scalability in KERI. @peacekeeper are you aware of a cooperative delegation (two DIDs specifying a delgator/delegate relationship) implementation in the DID-world? In KERI this allows, for instance, the ability to delegate an AID that can issue credentials on your behalf. That make horizontal scaling and other desirable features for bulk credentialing, etc. Lets discuss possible ways.