feat: support VectorUDT writes via UDT unwrapping in LanceArrowWriter#471

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LuciferYang wants to merge 2 commits intolance-format:mainfrom

LuciferYang:feat/vectorudt-roundtrip

Commits on Apr 21, 2026

feat: support VectorUDT (UserDefinedType) write and add roundtrip test
LuciferYang
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Commits on Apr 22, 2026

test: harden VectorUDT roundtrip assertions and reconstruction
LuciferYang
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