Add unknown datatype support#2410
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Add Iceberg unknown type parsing and conversions across schema, Arrow, Avro, HMS, and Glue paths. Reject non-null defaults for unknown fields and make set predicate formatting deterministic for stable tests. Co-authored-by: Codex <codex@openai.com>
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Add PrimitiveType::Unknown with JSON, Arrow, and Avro null mappings. Validate unknown fields as optional with null defaults and reject unsupported catalog conversions.
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