能否给Bubble加一个onTyping

### 需求动机

希望能解决bubble内容在typing时及时触发回调，比如自动滚动页面，目前的 onTypingComplete 在英文内容时触发不了或者触发时机不确定

### 提议的 API 是什么样的？

和onTypingComplete类似，但能解决onTypingComplete 在英文输入时的bug

Start by locating the Bubble component and its existing onTypingComplete entry point. Compare the proposed onTyping callback with the current English-typing behavior, then define and test when the callback fires so consumers can react during typing rather than only at completion.

Written by the indexing model from the issue text.