message: move attach time step from Writer::EndStep to Writer::BeginStep to include writer serialization and compression time to latency monitor
diff: @@ -132,6 +132,11 @@ StepStatus DataManWriter::BeginStep(StepMode mode, const float timeout_sec)
  std::cout << "DataManWriter::BeginStep " << m_CurrentStep << std::endl;
  }
  + m_Serializer.AttachTimeStamp(
  + std::chrono::duration_cast<std::chrono::milliseconds>(
  + std::chrono::system_clock::now().time_since_epoch())
  + .count());
  +
  return StepStatus::OK;
  }
  @@ -146,11 +151,6 @@ void DataManWriter::EndStep()
  m_Serializer.PutAttributes(m_IO);
  }
  - m_Serializer.AttachTimeStamp(
  - std::chrono::duration_cast<std::chrono::milliseconds>(
  - std::chrono::system_clock::now().time_since_epoch())
  - .count());
  -
  ++m_CombinedSteps;
  if (m_CombinedSteps >= m_CombiningSteps)
  