Add "MedicationDispense" domain object to core

We will be adding a new MedicationDispense domain object to core, based on the MedicationDispense object in FHIR (https://build.fhir.org/medicationdispense.html)

This new domain object is defined here:

https://wiki.openmrs.org/display/projects/Medication+Dispense+Data+Model

For this ticket, we should add all fields flagged as "Phase 1" in the above table

Things to add:

•  New MedicationDispense domain object with basic getters/setters
  •  Should extend BaseOpenmrsData and provide the standard audit visits of that class
  • When created JavaDocs reference FHIR fields each field maps to
• Liquibase to add new medication_dispense table
• Hibernate Mapping files to map from table to domain object

 This can just be added to the master branch of Core, for the 2.6 release.

For further information, see Talk post here:

https://talk.openmrs.org/t/proposal-medication-dispense-openmrs-module/36021