Replace String period start and end with ZonedDateTime and add new validator for ZonedDateTime periods.

[lukedegruchy]

• Take nullable ZonedDateTimes for all period start and ends where before evaluate measures took strings
• Add new validator to ensure period start and ends make sense vis-a-vis each others
• Adjust tests
• Add new test for validator

Closes #528

[github-actions]

Formatting check succeeded!

[codecov]

Codecov Report

Attention: Patch coverage is 92.72727% with 4 lines in your changes missing coverage. Please review.

Project coverage is 72.59%. Comparing base (21fceaa) to head (361147e).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...s/cqf/fhir/cr/measure/common/MeasureEvaluator.java	90.90%	1 Missing and 1 partial ⚠️
...fhir/cr/measure/common/MeasurePeriodValidator.java	90.00%	0 Missing and 1 partial ⚠️
...cds/cqf/fhir/cr/measure/r4/R4MeasureProcessor.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #538      +/-   ##
============================================
+ Coverage     72.56%   72.59%   +0.03%     
  Complexity       19       19              
============================================
  Files           361      362       +1     
  Lines         18562    18597      +35     
  Branches       2869     2874       +5     
============================================
+ Hits          13469    13501      +32     
- Misses         3733     3734       +1     
- Partials       1360     1362       +2     

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[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

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

See analysis details on SonarCloud