521 prospective gap calc

[Capt-Mac]

closes #521
closes #536

updates 'Date of Compliance' feature from String to Period Interval

depends on #532

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 9 lines in your changes missing coverage. Please review.

Project coverage is 67.38%. Comparing base (9d0cb6d) to head (960e72e).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...f/fhir/cr/measure/r4/R4CareGapStatusEvaluator.java	77.77%	0 Missing and 4 partials ⚠️
...cqf/fhir/cr/measure/r4/R4MeasureReportBuilder.java	69.23%	0 Missing and 4 partials ⚠️
...hir/cr/measure/enumeration/CareGapsStatusCode.java	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #533   +/-   ##
=========================================
  Coverage     67.38%   67.38%           
- Complexity     4141     4149    +8     
=========================================
  Files           355      355           
  Lines         18174    18193   +19     
  Branches       2805     2814    +9     
=========================================
+ Hits          12246    12260   +14     
+ Misses         4718     4717    -1     
- Partials       1210     1216    +6     

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