Scheduler simulator

[vsoch]

I started to look into ways to get more detail from the scheduler, and one idea is this simulator: https://github.com/kubernetes-sigs/kube-scheduler-simulator/tree/master.

That isn't the same as running real jobs, but I think we might try it out anyway. The other approach I'm thinking about it to make a bland / vanilla custom plugin that actually includes the kubernetes upstream schedule module that we can customize as we want! I'm looking for what a default config should look like (probably will just bring up a cluster and try to find it).