add k8s event record for rudr controller

[wonderflow]

fixes #316

This is a good start for rudr to add every important stage into kubenetes event. Then we could see the events from kubectl describe like below:

$ kubectl describe cfg first-app
Name:         first-app
Kind:         ApplicationConfiguration
...
Spec:
  Components:
    Component Name:  helloworld-python-v1
    Instance Name:   first-app-helloworld-python-v1
...
Events:
  Type     Reason                                                                                     Age   From  Message
  ----     ------                                                                                     ----  ----  -------
  Warning  ApiError NotFound ("componentschematics.core.oam.dev \"helloworld-python-v1\" not found")  3s          creating AppConfig first-app error

$ kubectl describe cfg first-app
Name:         first-app
Kind:         ApplicationConfiguration
..
Events:
  Type    Reason  Age   From  Message
  ----    ------  ----  ----  -------
  Normal          41s         component helloworld-python-v1 created

[hongchaodeng]

lgtm