是否考虑新增一个useStickyFixed()，用于获取当前元素是否处于吸顶状态？

当元素处于吸顶状态，会处理一些样式或逻辑，这种场景还是很多的；
类似这种
```js
const isFixed = useStickyFixed({ref:domRef});
```

The issue proposes a new TypeScript/React hook with the API useStickyFixed({ref: domRef}) to report whether an element is currently sticky. First clarify the expected return value and how sticky-state transitions should be detected; done means the hook behavior and its edge cases are covered by tests.

Written by the indexing model from the issue text.