dispose method

Implementation

Future<void> dispose() async {
  pauseSync();

  await Future.wait([
    ..._managers.allManagers.map((m) => m.dispose()),
    ..._managerSubscriptions.map((s) => s.cancel()),
  ]);
  await _eventController.close();
  await _metricsSubject.close();
  await _statusSubject.close();
}