Support exporting compliance results

[rhmdnd]

As a user or consumer (which could be another machine), I need to export compliance results in one human-readable format (PDF) and one machine-readable format (CSV).

Acceptance Criteria:

• Must provide a documented gRPC API endpoint that returns a document type containing the compliance results
• May support additional query parameters (e.g., return a report for all successful checks)
• Must be accompanied by an end-to-end test that generates reports based on scan data provided by the compliance operator