Conversion of Model hierarchy to Kotlin

[JPercival]

• Converted the rest of the cql2elm.model package to Kotlin
• Removed dead paths for exception handling
• Fixed some null pointer exceptions resulting from stricter null handling

[github-actions]

Formatting check succeeded!

[codecov]

Codecov Report

Attention: Patch coverage is 70.11834% with 404 lines in your changes missing coverage. Please review.

Project coverage is 66.01%. Comparing base (e9b4887) to head (c2e7b8b).
Report is 1 commits behind head on feature-kotlin.

Files with missing lines	Patch %	Lines
...org/cqframework/cql/cql2elm/model/ModelImporter.kt	54.80%	125 Missing and 35 partials ⚠️
...work/cql/cql2elm/model/InstantiationContextImpl.kt	49.33%	66 Missing and 10 partials ⚠️
...org/cqframework/cql/cql2elm/model/ConversionMap.kt	72.52%	44 Missing and 17 partials ⚠️
...g/cqframework/cql/cql2elm/model/CompiledLibrary.kt	70.16%	27 Missing and 10 partials ⚠️
...org/cqframework/cql/cql2elm/model/OperatorEntry.kt	85.78%	19 Missing and 9 partials ⚠️
...ork/cql/cql2elm/model/ResolvedIdentifierContext.kt	65.00%	10 Missing and 4 partials ⚠️
...in/java/org/cqframework/cql/cql2elm/model/Model.kt	83.01%	4 Missing and 5 partials ⚠️
...va/org/cqframework/cql/cql2elm/model/Conversion.kt	90.00%	2 Missing and 5 partials ⚠️
...va/org/cqframework/cql/cql2elm/LibraryBuilder.java	78.57%	2 Missing and 1 partial ⚠️
...lm/preprocessor/CqlPreprocessorElmCommonVisitor.kt	57.14%	0 Missing and 3 partials ⚠️
... and 3 more

Additional details and impacted files

@@                 Coverage Diff                  @@
##             feature-kotlin    #1457      +/-   ##
====================================================
+ Coverage             65.86%   66.01%   +0.15%     
- Complexity             2438     2755     +317     
====================================================
  Files                   487      487              
  Lines                 28599    28447     -152     
  Branches               5497     5459      -38     
====================================================
- Hits                  18836    18780      -56     
+ Misses                 7536     7476      -60     
+ Partials               2227     2191      -36     

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[sonarqubecloud]

Quality Gate failed

Failed conditions
72.7% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud