fix select int columns

[p-hoffmann]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes handling of integer columns and other data types in the Arrow-to-JSON conversion function. The change adds comprehensive support for additional Arrow data types that were previously missing, including various integer sizes, unsigned integers, binary data, date/time types, and decimal values.

• Adds support for Int8, Int16, Int32, UInt8, UInt16, UInt32, UInt64, and Float32 data types
• Implements binary data encoding using base64
• Adds comprehensive date, time, and timestamp handling with proper TimeUnit matching

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 3 comments.

File	Description
ext/trex/lib.rs	Adds extensive data type handling in field_value_to_json function with proper Arrow array imports
ext/trex/Cargo.toml	Adds base64 dependency for binary data encoding

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