Allow VM to register custom actors in VM

[austinabell]

Task summary

Code is setup to match on the cid to dispatch to builtin actors, and this will not change but something should be added to the vm structure such as a HashMap to allow registering other actors to check after the builtin match (not all should be in a hashmap to avoid having to lookup in that hashmap for builtin successful calls.

This is just used for test vectors to allow the vm to register puppet actor (#566) and chaos actor (#640)

Specification reference

Other information and links