应用: 抖音
任务: 启动抖音，找到消息栏，发送私信‘今天天气真好’
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: TYPE
type_text: 今天天气真好
step_id: 5
action: CLICK
step_id: 6
action: STOP