Add didBuild lifecycle

[rrousselGit]

Some use-case such as mobxjs/mobx.dart#14 wants to trigger some custom logic right after the build method ended.

We can create a custom life-cycle on hooks to support this use-case:

class _SomeHookState extends HookState<T, Hook<T>> {
  @override 
  void didBuild() {
    // TODO: do something after `HookWidget.build` but because the children build.
  }
}

• useAsyncEffect
• useErrorBoundary

[rrousselGit]

A potential use case to this life-cycle:

Pusing routes or marking an Overlay as needing build