initial attempt at moving cluster auditor to prometheus/grafana

Initial Spike for OPA Collector

Grafana dashboard shows violations for each namespace:

• Table for each violation
• Timeseries to show trends over time
• Shapshot of what violation types are present

Source code for exporter: https://github.com/runyontr/opa-scorecard (not ready, but here for context)

Questions

• Should we add a "Full Cluster" option to show all the violations around the cluster?
• Is data easy enough to search to find violations?
• filtering doesn't seem to work yet, but seems useful:

#685 (closed)