Convert elm, elm-xmlutil, model-xmlutil to Kotlin Multiplatform (Kotlin feature branch)

[antvaset]

What's included:

• The elm, elm-xmlutil, model-xmlutil modules are converted to Kotlin Multiplatform.
• BigDecimal is polyfilled with kt-math-js in Kotlin/JS. Native java.math.BigDecimal is used on the JVM. WASM is not supported at the moment.
• ElmLibraryReader and ElmLibraryWriter are simplified to use kotlinx.io.Source and kotlinx.io.Sink or simple strings.

[github-actions]

Formatting check succeeded!

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 68.89%. Comparing base (dfa7f4a) to head (5260d84).
Report is 1 commits behind head on feature-kotlin.

Files with missing lines	Patch %	Lines
...otlin/org/cqframework/cql/cql2elm/CqlTranslator.kt	50.00%	2 Missing ⚠️
...tlin/org/cqframework/cql/cql2elm/LibraryManager.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                  @@
##             feature-kotlin    #1494      +/-   ##
====================================================
+ Coverage             68.13%   68.89%   +0.75%     
+ Complexity             4783     3990     -793     
====================================================
  Files                   464      442      -22     
  Lines                 27536    25482    -2054     
  Branches               5266     4525     -741     
====================================================
- Hits                  18762    17556    -1206     
+ Misses                 6618     5862     -756     
+ Partials               2156     2064      -92     

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[sonarqubecloud]

Quality Gate failed

Failed conditions
69.6% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud