Add classification to Address

For the Epidemiology use case (and potentially others) it is useful to futher classify the patient's address beyond what is available in Address.use. For example: "Assisted living facility, school, dormitory, Long-term care facility/nursing home, Correctional facility, Shelterm Day care/group baby-sit, Unknown, Other congregate living facility".

Recommend adding Address.classification as a CodeableConcept with an example binding to allow specific use cases to classify address as needed.