Diagnosis support for ConditionClinicalStatuses recurrence, relapse, remission, resolved

Diagnoses should be able to have any of the FHIR-supported clinical statuses: recurrence, relapse, remission, resolved.

The current object supports ACTIVE and INACTIVE, which are part of the FHIR spec, and HISTORY_OF, which is not. See https://github.com/openmrs/openmrs-core/blob/4c02f3dc1eb47740c044a03f20413bc144173113/api/src/main/java/org/openmrs/ConditionClinicalStatus.java