Add total GPU memory utilization (#86250)
Although we already have per process GPU memory usage, I'm curious to see what is the number for `gpu_utilization.memory` per https://docs.nvidia.com/deploy/nvml-api/structnvmlUtilization__t.html. Also fixing a tiny typo issue that has been bugging me for a while `total_gpu_utilizaiton`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/86250
Approved by: https://github.com/ZainRizvi
