Include memory per core metric in crc-idle utilization

[Comeani]

It's possible for the crc-idle output to be misleading in that the cpu availability that Slurm reports does not contain any notion of the memory they are using.

Even using the max between the cpu utilization and the memory utilization would be more helpful for users who are looking to use the tool specifically when they are tweaking their job submission files to get their jobs running.