PyNvVideoCodec: Allow disabling session timing printouts

For the next release of PyNvVideoCodec, we would deeply appreciate if you made it possible to disable the logging of session initialization and deinitialization times in src/VideoCodecSDKUtils/helper_classes/NvCodec/NvDecoder/NvDecoder.cpp. These messages create a bunch of unnecessary noise in the logs for our distributed jobs, and there doesn’t appear to be any simple way to disable them without temporarily redirecting stdout, since the STOP_TIMER macro uses std::cout directly.