应用: 抖音
任务: 打开抖音，浏览首页的第一个视频，留言‘真棒’
操作步骤:
step_id: 0
action: CLICK
step_id: 1
action: CLICK
step_id: 2
action: CLICK
step_id: 3
action: TYPE
type_text: 真棒
step_id: 4
action: CLICK
step_id: 5
action: STOP