ELM JSON reader and writer (Kotlin feature branch)

[antvaset]

What's included:

• QNames are serialized in JSON as strings formatted as {NAMESPACE_URI}LOCAL_PART, consistent with JAXB + MOXy. Uses a subclassed QNameSerializer with a modified serial descriptor.
• BigDecimals are serialized in JSON as numbers and not strings, consistent with JAXB + MOXy. Relies on contextual serialization.
• Initial code consolidation and cleanup.

Remaining tasks:

• Handling ELM annotations which are typed as java.io.Serializable.

[github-actions]

Formatting check succeeded!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.24%. Comparing base (b5a62e8) to head (f9168c2).
Report is 1 commits behind head on feature-kotlin.

Additional details and impacted files

@@                Coverage Diff                @@
##             feature-kotlin    #1489   +/-   ##
=================================================
  Coverage             68.24%   68.24%           
+ Complexity             4786     4785    -1     
=================================================
  Files                   461      463    +2     
  Lines                 27496    27484   -12     
  Branches               5264     5264           
=================================================
- Hits                  18764    18756    -8     
+ Misses                 6575     6571    -4     
  Partials               2157     2157           

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[sonarqubecloud]

Quality Gate failed

Failed conditions
72.2% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud