New property on userAction to display user friendly query when action is triggered

When a userAction is triggered, the host doesn't have a good way to show a user friendly message. Currently we are just showing "User action triggered" in the turn.

There should be a way for agent to pass through a user friendly message, associated with the userAction.

Proposing to add it as a property on userAction

查找 userAction 类型定义以及显示回合消息的组件。Agent 需要传递一个对用户友好的 message 属性。检查回合是如何渲染的，以及文本 'User action triggered' 当前显示在哪里。更新类型和显示逻辑以使用新属性。

由索引模型根据 Issue 内容生成。