[AIChatDialogue] 提供返回到顶部的函数

[YannLynn]

Which Component Need Enhancement 期望新增功能的组件

• AIChatDialogue

What does the proposed API look like 期望支持的API

backToTop function method

Feature Description 功能描述

提供返回到顶部的函数
Provide a function to return to the top

Additional information 补充说明