使用webhook插件发送通知

用户可以在流水线中配置webhook通知插件，流水线运行状态信息会自动发送到用户配置的链接地址。

用户可以为任务添加webhook插件。用户需要配置接受webhook的uri地址。注意该地址必须公网可访问。

云效发送的webhook请求一律为post请求，任务状态信息的payload示例如下。

{
  "event": 'task',
  "action": 'status',
  "task": {
    "pipelineId": 183,
    "pipelineName": 'test pipeline',
    "stageName": '构建',
    "taskName": 'java构建',
    "buildNumber": 19,
    "statusCode": 'SUCCESS', \\ UNKOWN, RUNNING, WAITING, CANCELLING, CANCELED,FINISH,SUCCESS,FAIL,SKIP  
    "statusName": '运行成功',
    "pipelineUrl": 'https://rdc.aliyun.com/ec/pipelines/156539?build=19',
    "message": '[test pipeline]流水线阶段[构建]任务[java构建]运行成功'
  },
  "sources": [
    {
      "repo": 'git@gitlab:test.git',
      "branch": 'master',
      "commitId": 'xdfdfdff',
      "privousCommitId": 'ddddd',
    }
  ],
  "globalParams": {
    "key1": 'aaa',
    "key2": 'bbb',
  }
}