Refactor namespaces

The current namespace is getting hard to manage for a few reasons:
1. Too much functionality in the "Core"
2. Logging-related features are not scoped to the specific data stream (e.g. camera)

This is a proposal for a new organization:
- Models (automatically generated models from aind behavior services, these should ideally be namespace. E.g.: Rig, Session, DataTypes, etc...)
- (Core + Core.Design + Logging primitives, have core operators and functionality needed for all others)
- Vision (Camera + Camera logging)
- VR (all syntactic sugar related with virtual reality environments)
- Harp (harp logging, harp board inits, other recipes)