refactor: Introduce Riverpod for state management

[BlakeBarrett]

Ask

As a developer, I want to be able to resolve shared state across the widget tree, So that widgets can have access to the data they need, no matter their location in the widget tree.

Notes

https://riverpod.dev/docs/introduction/getting_started

• selectedArtifact or some such, should be accessible app wide
• currentUser should be accessible app wide

  Stretch Goal

• Abstract away the API