Fix dataclass field ordering conflict when inheriting from parent with default fields

[koxudaxi]

Summary

• Fix TypeError caused by dataclass field ordering when a child class inherits from a parent with default fields and adds new required fields
• For Python 3.10+: Automatically add field(kw_only=True) to new required fields to avoid ordering conflict
• For Python 3.9: Emit UserWarning since the issue cannot be automatically fixed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.61%. Comparing base (747fed5) to head (35df298).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2664      +/-   ##
==========================================
- Coverage   99.66%   99.61%   -0.06%     
==========================================
  Files          76       76              
  Lines       10481    10538      +57     
  Branches     1261     1280      +19     
==========================================
+ Hits        10446    10497      +51     
- Misses         16       21       +5     
- Partials       19       20       +1     

Flag	Coverage Δ
unittests	99.61% <100.00%> (-0.06%)	⬇️

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[codspeed-hq]

CodSpeed Performance Report

Merging #2664 will not alter performance

_{Comparing fix/dataclass-inheritance-field-ordering (35df298) with main (f7ffbd0)}

Summary

✅ 50 untouched
⏩ 3 skipped¹

Footnotes

1. 3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩