Fab浮动按钮怎么可以拖动？

之前的 FloatButton可以拖动，现在 Fab(https://taro-ui.jd.com/#/docs/fab) 需要怎么做可以拖动？

Start with the Fab documentation linked in the issue and inspect the repository's Fab and FloatButton entry points to understand their existing behavior. Clarify the intended drag interaction and supported platforms before implementation; done should mean Fab can be dragged consistently and its behavior is covered by the project's relevant checks.

Written by the indexing model from the issue text.