[preact/compact] Suppport react-is

**Describe the feature you'd love to see**
Some libraries use `react-is` to check types of react element.
Will `@preact/compat` support `react-is`?
**Additional context (optional)**
https://www.npmjs.com/package/react-is
```
// for example
import { isMemo, isFragment } from 'react-is'
```