应用: 拼多多
任务: 打开拼多多，搜索“儿童书包”，进入第三个商品，领取券
操作步骤:
step_id: 0
action: CLICK
step_id: 1
action: CLICK
step_id: 2
action: TYPE
type_text: 儿童书包
step_id: 3
action: CLICK
step_id: 4
action: CLICK