move attach time step from Writer::EndStep to Writer::BeginStep to include writer serialization and compression time to latency monitor
move attach time step from Writer::EndStep to Writer::BeginStep to include writer serialization and compression time to latency monitor

ornladios/ADIOS2,ornladios/ADIOS2,JasonRuonanWang/ADIOS2,JasonRuonanWang/ADIOS2,JasonRuonanWang/ADIOS2,ornladios/ADIOS2,ornladios/ADIOS2,JasonRuonanWang/ADIOS2,ornladios/ADIOS2,JasonRuonanWang/ADIOS2