API URL

Motivation

• API URL must support versioning (example IBM MQ, example Chargebee):
• Old API must stay supported for a certain period of time

Functional design

• old API is available at /api/v1/... (for the period of AIR migration it will be available both on /api/ and /api/v1/)
• new API is available at /api/v2/...
  • "v1" is not allowed as an owner name, at least until API "v1" is ready

TODO: add endpoint for the list of supported versions