Definition objects should support dynamic register

[erdun]

With api schemes update and new operation registed, OMA controller must update, rebuild and redeploy, should support getting api scheme from endpoint

apiVersion: core.oam.dev/v1alpha2
kind: WorkloadDefinition
metadata:
  name: schema.example.oam.dev
spec:
  definitionRef:
    url: schema.controller.svc

[wonderflow]

Good idea! You mean a discovery mechanism, right? Renaming url to discovery maybe better?

[erdun]

Yes