Add Automation UI

Created by: felixfbecker

Adds the UI for the automation 3.8 milestone.

New pages:

• Global campaigns list
• Global campaign details list
  • Shows progress bar with status (no historical burndown chart yet)
  • Lists changesets (no add functionality yet, need to use API)
  • No delete, edit yet
• Global new campaign form (with dropdown for namespace)

I am using React hooks for all components, and a new hook for Observables.