Merge branch 'feature/PATREG-139-implement-service-on-xref-query-with-identifier' into feature/PATREG-122

# Conflicts:
#	patient-registry-model-api/src/main/java/net/ihe/gazelle/app/patientregistryapi/application/PatientCrossReferenceSearch.java
#	patient-registry-model-api/src/main/java/net/ihe/gazelle/app/patientregistryapi/application/SearchCrossReferenceException.java