Implement an API to return profiles applicable to a compliance target #55
Description
As a user or consumer (which could be another machine), I need to be able to see what profiles are applicable to a compliance target (e.g., OpenShift cluster).
Acceptance Criteria:
- Must provide a documented gRPC API endpoint that allows users to ask for profiles associated to a compliance target/subject
- Must return a valid error for non-existent clusters
- Must be accompanied by an end-to-end test that queries the compliance service using compliance scan data from the compliance operator