Implement an API to filter scan results by outcome

[rhmdnd]

As a user or consumer (which could be another machine), I need to be able to filter compliance results by outcome. For example, I may want to know which compliance checks passed, failed, or were manual.

Acceptance Criteria:

• Must provide a documented API endpoint for filtering compliance results by outcome
• Must return an empty set if compliance results do not match the query
• Must be accompanied by an end-to-end test that queries compliance results from an OpenShift compliance scan