Use ResourceType for FHIR Engine data access APIs

[jingtang10]

Describe the Issue

Using class parameter (e.g. Patient::class.java) as the input of the data access API has certain issues:

• app developer is able to use Resource::class.java which isn't legal because you cannot have a resource that isn't a concrete resource type
• app developer is able to use MyPatient::class.java which isn't legal as it's not a FHIR type

As a result we are refactoring the data access APIs to use the ResourceType (HAPI FHIR lib) as the input parameter to specify the type of FHIR resource in the operations.

Would you like to work on the issue?
yes