Ensure abstract classes are set to retrievable = false in ModelInfo.

[lukedegruchy]

Ensure abstract classes are set to retrievable = false in ModelInfo.

Description

Ensure StructureDefinitions with abstract result in the corresponding ModelInfo class having retrievable = false.

• Github Issue: Retrieval of DomainResource should warn/error clinical_quality_language#1392
• I've read the contribution guidelines
• Code compiles without errors
• Tests are created / updated
• Documentation is created / updated

By creating this PR you acknowledge that your contribution will be licensed under Apache 2.0

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 21.85%. Comparing base (6dd2f5c) to head (02d57ae).
Report is 1 commits behind head on master.

Files	Patch %	Lines
...pencds/cqf/tooling/modelinfo/ClassInfoBuilder.java	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #533      +/-   ##
============================================
- Coverage     21.85%   21.85%   -0.01%     
  Complexity     1673     1673              
============================================
  Files           297      297              
  Lines         25390    25392       +2     
  Branches       4005     4004       -1     
============================================
  Hits           5550     5550              
- Misses        18920    18922       +2     
  Partials        920      920              

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