应用: 抖音
任务: 打开抖音，找到首页第四个视频，给它点个赞
操作步骤:
step_id: 0
action: CLICK
step_id: 1
action: SWIPE
step_id: 2
action: SWIPE
step_id: 3
action: SWIPE
step_id: 4
action: CLICK
step_id: 5
action: STOP