feat(operations): Add PrometheusRules CRD

[blufor]

PR Description

Adds CRD for PrometheusRules, content aligned with pre-existing PodLogs CRD.

Which issue(s) this PR fixes

Part of #221

Notes to the Reviewer

I'm not familiar with the repository operations (adding docs, whether there are even tests for CRD YAML files). I've successfully deployed the CRD to the cluster. Let me know if there's further work that needs to be done

PR Checklist

• [ ] CHANGELOG.md updated
• [ ] Documentation added
• [ ] Tests updated
• [ ] Config converters updated