Add spec.interceptors and spec.sink params in ClusterLogConfig/LogConfig CRD

[ethfoo]

logConfig example below:

apiVersion: loggie.io/v1beta1
kind: LogConfig
metadata:
  name: tomcat
  namespace: default
spec:
  selector:
    type: pod
    labelSelector:
      app: tomcat
  pipeline:
    sources: |
      - type: file
        name: common
        paths:
          - stdout
          - /usr/local/tomcat/logs/*.log
    sink: |
      type: dev
      printEvents: false
    interceptors: |
      - type: rateLimit
        qps: 90000

So we can add sink/interceptors in ClusterLogConfig/LogConfig directly.

note:

• sink/interceptors in logConfig have higher priority than sinkRef/interceptorRef, so when there are sink and sinkRef both in the logConfig, only sink is validate.

[ethfoo]

TODO:
release in v1.1.0

• update kubernetes usage docs