Provide question statuses

[cortadocodes]

Question statuses

• Non-existent:
  • Question doesn't exist in event store
• Pending
  • Question in event store
  • No other events recorded in event store for question
• Running
  • Event in event store
  • No result or exception event in event store
  • And/or there's a running pod or job in k8s cluster
• Succeeded
  • Result event in event store
• Failed
  • Exception or failure event in event store
• Cancelled
  • Cancelled event in event store

New event types

• Failed - sent by k8s pod on non-code failure (e.g. image can't be pulled)
• Cancelled

Questions

• Should these statuses exist in:
  • The service communication event store?
  • Or a new table of question statuses?
  • The new event types aren't really inter-service communication but they should probably be communicated to the parent anyway so they could become part of that