Upstream issue: https://github.com/korrel8r/korrel8r/issues/17

Allow korrel8r to run as a service, used by some other system - e.g. the openshift console.

• Define REST API for korrel8r as a service
• Extend korrel8r --web mode to serve the REST API.
• Provide images to run it in a cluster.

The REST API should provide all features available via web UI in API form.
Initial sketch:

/api/v1/correlate/queries?start=<[query|object]L&goal=<domain/class>

• body: YAML or JSON representation of start query or object
• response: JSON list of queries for goal class.

/api/v1/correlate/objects?start=<[query|object]L&goal=<domain/class>

• body: YAML or JSON representation of start query or object
• response: JSON list of objects of goal class.