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

尋找 userAction 型別定義，以及顯示回合訊息的元件。Agent 需要傳遞一個對使用者友善的 message 屬性。檢查回合如何進行渲染，以及文字 'User action triggered' 目前顯示在哪裡。更新型別和顯示邏輯以使用新的屬性。

由索引模型根據 Issue 內容生成。