Hooks async utils

Create a task hook using: final incrementTask = useAsyncTask(); and use it to create a callback which will prevent double clicking as long as the async function is running:

      floatingActionButton: FloatingActionButton(
        onPressed: incrementTask.asyncTaskCallback((progress) async {
          progress.progressLabel = 'Doing something exciting..';
          await Future.delayed(const Duration(seconds: 2));
          progress.progressLabel = 'Almost done.';
          await Future.delayed(const Duration(seconds: 1));
          count.value = count.value + 1;
        }),

See example/lib/main.dart for details.