Interface
Common
```kotlin
interface ObserverModifierNode : DelegatableNode
```
`Modifier.Node`s that implement ObserverNode can provide their own implementation of
`onObservedReadsChanged` that will be called in response to changes to snapshot objects read
within an `observeReads` block.
## Functions
onObservedReadsChanged
```kotlin
fun onObservedReadsChanged()
```
This callback is called when any values that are read within the `observeReads` block change.
It is called after the snapshot is committed. `onObservedReadsChanged` is called on the UI
thread, and only called once in response to snapshot observation. To continue observing
further updates, you need to call `observeReads` again.