Function
findRootCoordinates
Common
```kotlin
fun LayoutCoordinates.findRootCoordinates(): LayoutCoordinates
```
Walks up the `LayoutCoordinates` hierarchy to find the `LayoutCoordinates` whose
`LayoutCoordinates.parentCoordinates` is `null` and returns it. If
`LayoutCoordinates.isAttached`, this will have the size of the
`ComposeView`.