tests: add SQL file tests for arrays_zip

[andygrove]

Summary

Adds a SQL file test for arrays_zip at spark/src/test/resources/sql-tests/expressions/array/arrays_zip.sql.

arrays_zip is not yet implemented in Comet (tracked in docs/spark_expressions_support.md), so all queries use spark_answer_only mode. This establishes correct expected behavior and makes it easy to tighten tests to query mode once a native implementation is added.

The test file covers:

• Two-, three-, and four-array zip with column references
• Mixed element types: int, bigint, string, boolean, double
• NULL elements within arrays (produce null fields in output structs)
• NULL array input (entire result is null)
• Unequal-length arrays (shorter arrays padded with null)
• Empty arrays as input
• Literal arguments
• Zero-argument call returning empty array
• Single-argument zip
• Nested arrays as element type
• Parquet dictionary encoding on and off via ConfigMatrix

[andygrove]

@hsiang-c fyi

[hsiang-c]

Thanks Andy, I‘ve added a SQL file at #3643, PR is still in draft, I'll wrap it up soon.