fix: register java.util.HashSet in OWLAPIMapper to fix get_punned_iris()

[Demirrr]

Summary

• Fixes a bug reported in Expose more Java-side methods for SyncOntology #278 (Expose more Java-side methods for SyncOntology #278 (comment)): SyncOntology.get_punned_iris() raised RuntimeError: Inconsistent hierarchy whenever the ontology actually contained a punned IRI.
• getPunnedIRIs() returns a concrete java.util.HashSet when non-empty. OWLAPIMapper.map_() (a functools.singledispatchmethod) had no exact registration for HashSet, so it fell back to MRO-based dispatch over JPype's dynamically-generated Java class proxies, which can't always produce a consistent C3 linearization — hence the crash. This is the same failure mode LinkedHashSet was already patched for previously.
• Fix: register HashSet directly alongside the existing LinkedHashSet/ArrayList/List/Set registrations, so singledispatch hits its exact-type fast path instead of the MRO resolver.

Test plan

• Reproduced the exact traceback from the issue with the reporter's repro script before the fix, confirmed it's fixed after
• Added test_get_punned_iris_with_punning in tests/test_sync_ontology.py, reproducing the issue's punning scenario (verified it fails with the pre-fix code and passes with the fix)
• ruff check owlapy --line-length=200 passes
• tests/test_sync_ontology.py, tests/test_owlapi_mapper.py, tests/test_owlapy_ontology_management.py all pass (39 passed)
• Updated CHANGELOG.md's [Unreleased] section

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.44%. Comparing base (5851191) to head (6edc750).
⚠️ Report is 8 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #280      +/-   ##
===========================================
+ Coverage    83.34%   83.44%   +0.09%     
===========================================
  Files           67       67              
  Lines        12408    12521     +113     
===========================================
+ Hits         10342    10448     +106     
- Misses        2066     2073       +7     

Flag	Coverage Δ
unittests	83.44% <100.00%> (+0.09%)	⬆️

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