Add all the types that we will use (interface types) and implement those abstract classes (structs need to be written) BETA sp7

Note: There is some concern that the early V1 actor implementation was not thought out enough and then was never used properly.
Unknown costs: how many place will we have to change to this new paradigm? What is the balance between what we need now and what we need in the near term this year for the sake of technical debt and future work load and flexibility?

• Work with Steven to understand what the best path and timing is for the actor interface for both RBAC and AuthN
• write the interface type. See RFC.
• implement the interface for the actors that we want. User, Workspace actors. Permission types for RBAC should be stubbed out for use here.