Add routes to service to introspect details of loaded ontologies

[cmungall]

Currently it's hard to know what is 'behind' a service. We want to add this for users, and our own debugging.

dropwizard has some out the box healthchecks we can use?

Additionally, we'd like a route such as kb/meta that provides something like https://monarchinitiative.org/owlsim/

[cmungall]

Iterate through all Ontology objects in import chain, report on OntologyAnnotations + OntologyID