Add Support for creating for user_patient_property into OpenMRS Data Model

Background

There are a growing number of examples within OpenMRS 3.0 of needing to be able to store user-specific application state. This is being partly being handled at TRUNK-6020

In some instances, however, there may arise need to store user-patient-specific state, which is currently not supported in the data model.

Solution

Add support for UserPatientProperty to OpenMRS.

• user_patient_property table following conventions in TRUNK-6060 (user, patient, property, and property value)
• User, patient, and property should be unique
• Property value as MEDIUMTEXT
• Service should require View Patient privilege – i.e., if a user loses this privilege, they shouldn't have access to UserPatientProperty values.
• Associated REST API endpoints