Add interfaces on top of R4CareGapsProcessor and R4CareGapsService

[lukedegruchy]

• See Add interfaces to R4MeasureService and R4MultiMeasureService. #510 for similar work done for measure evaluation services
• Add interfaces on top of R4CareGapsProcessor and R4CareGapsService so downstream systems can use composition instead of inheritance.

[github-actions]

Formatting check succeeded!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.13%. Comparing base (7916b7b) to head (810e1cd).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #624      +/-   ##
============================================
+ Coverage     74.09%   74.13%   +0.03%     
  Complexity       19       19              
============================================
  Files           363      363              
  Lines         19054    19054              
  Branches       2531     2531              
============================================
+ Hits          14119    14126       +7     
+ Misses         3595     3590       -5     
+ Partials       1340     1338       -2     

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud