Add cis benchmarks

[fhielpos]

Checklist

• Update changelog in CHANGELOG.md.
• Make sure values.yaml and values.schema.json are valid.
• (Giant Swarm) If creating a release, bump the version and appVersion in Chart.yaml.

[stone-z]

A couple early things. Will look again when you're ready (also after you use the new reconciliation pattern if you wanted to do that)

[fhielpos]

I think that everything is done here. I will leave some examples on how the metrics look:

starboard_exporter_ciskubebenchreport_report_summary_count

starboard_exporter_ciskubebenchreport_section_summary_count

starboard_exporter_ciskubebenchreport_result_info

@stone-z all yours. If you think it's okay we can merge it and then update the docs too

[fhielpos]

Updated the README to add the new feature details.

[stone-z]

Some mostly small things, open to your preference on them

[fhielpos]

Pushing for now so I can test before finally adding the missing ConfigAuditReport metrics to the readme.

[stone-z]

🚀 bam