Add support for `@JsonIgnoreType` for endpoints

Dropwizard JAX-RS provider seems to add special handling to make anything annotated with `@JsonIgnoreType` (that is, any endpoint annotated) to be considered "untouchable", that is, not to be processed using Jackson ObjectMapper. This makes sense in that it allows marker for certain kinds of specific classes that Jackson can not and should not handle, instead deferring to some other processing component.