feat(core): native rest endpoints for agents

[ejfitzgerald]

Summary

Initial concept of creating native rest endpoint support for agents.

Missing features

• [ ] Add support for Bureau for rest endpoints
• [ ] Agentverse hosting updates for rest endpoints
• [ ] Adding support for agents who are using the Mailbox
• [x] Probably a whole load of additional things too 😁
• [ ] Add tests

[devjsc]

🎉