feat: support Iceberg v3 unknown type#662
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Add an Iceberg unknown primitive type and JSON, Arrow, Avro, Parquet, projection, and data path support for null-only unknown fields. Enforce optionality invariants so required projections cannot be materialized from unknown/null-only fields. Co-authored-by: Codex <codex@openai.com>
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Closes #665
Summary
Validation
Co-authored-by: @codex