`ComputedNotifier` is a new `ValueListenable` implementation that computes its value based on other `ValueListenable` instances. This facilitates efficient and reactive updates for derived state, eliminating the need for manual dependency tracking and update propagation.

The class listens to changes from provided dependencies and recomputes its value whenever any of them change, notifying its listeners only when the computed value itself changes.

Clarifies that `ComputedNotifier` is also a preferred alternative to `Stream` subclasses, aligning with the preference for `ValueNotifier` and `ChangeNotifier` in Flutter framework code.