应用: 拼多多
任务: 打开拼多多，搜索“背心”，点击第二条商品，选择尺码为“L”
操作步骤:
step_id: 0
action: CLICK
step_id: 1
action: CLICK
step_id: 2
action: TYPE
type_text: 背心
step_id: 3
action: CLICK
step_id: 4
action: CLICK