应用: 钉钉
任务: 启动钉钉，进入消息中心，点击顶部加号，启动视频会议
操作步骤:
step_id: 0
action: CLICK
step_id: 1
action: CLICK
step_id: 2
action: CLICK
step_id: 3
action: CLICK
step_id: 4
action: CLICK
step_id: 5
action: STOP