Add tools for profiling memory

[BlaiseMuhirwa]

Runs cadvisor to collect host system stats including CPU, memory, etc. Also runs Prometheus + Grafana, which expose port 8080 and 9090 respectively. This means that you can port-forward to your local machine and visualize statistics in your browser.

You can do that by setting up an SSH tunnel like this

$ ssh -L 3000:localhost:3000 -L 8080:localhost:8080 <user>@<hostname>