Implement initial version of the service that will manage tagging library versions for the %Delivery as a Service MVP effort.

We can probably re-use the deprecator project as a template.

Requirements for initial implementation:

• GitHub Support
  • Fetches all repositories on which the Delivery as a Service app is installed.
  • Schedules those repositories for processing using Redis DB.
  • Processes those repositories (will initially be a noop) in worker process.
• Architected for GitLab support (Long-term we will want to reuse this service for this very GitLab repository).