Enable custom annotations in Policy Controller pods

[gsantos-hc]

Description of the change

Add the ability to customize annotations on Policy Controller pods.

Existing or Associated Issue(s)

Fixes #766

Additional Information

Checklist

• [x] Chart version bumped in Chart.yaml according to semver. Where applicable, update and bump the versions in any associated umbrella chart
• [X] Variables are documented in the values.yaml and added to the README.md. The helm-docs utility can be used to generate the necessary content. Use helm-docs --dry-run to preview the content.
• [x] JSON Schema generated.
• [ ] List tests pass for Chart using the Chart Testing tool and the ct lint command.