Add ComplianceFrameworksController for JSON export

What does this MR do and why?

Add ComplianceFrameworksController for JSON export

This branch adds a controller to represent a compliance framework and its related requirements and controls in JSON format. This will be used to download a compliance framework in JSON for sharing or re-using.

References

End goal: Compliance Framework upload/download templates We want to create a repository of framework templates and the ability to upload/download them to a Compliance Framework through an API and UI

This controller will be used by the UI for this issue: Download framework UI

Screenshots or screen recordings

This change doesn't create any UI changes.

How to set up and validate locally

1. Go here: http://localhost:3000/groups/toolbox/-/security/compliance_dashboard/frameworks and create a framework
2. Keep track of the framework ID
3. Go here: http://localhost:3000/groups/toolbox/-/security/compliance_dashboard/frameworks/1.json replacing 1 with your framework ID.
4. Verify that there's JSON to represent your framework.