care-gaps to use R4MultiMeasureService

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Description

The current $care-gaps operation exposes several parameter & configuration properties that have no functional overlap with existing R4MeasureService. This lack of direct overlap creates a need for additional logic to enable the caregaps service.

We now have the R4MultiMeasureService offering that allows for elimination of redundant code and increased efficiency and the ability to allow for parameters that are not functioning to now be functional per specification.

Proposed Changes

• Migrate measure service classes
• enable measureIdentifier parameter (currently returns error)
• enable Practitioner and Group of Practitioners through "subject" (Practitioner returns error currently)
• disable un-used parameters (topic, program, organization, practitioner) - currently return errors
• future patient attribution models can be exposed through reference within the "subject" parameter.