Convert nanos to timstamptz

[ahmedabu98]

Unblocking internal import
Just copying Iceberg's current implementation

[gemini-code-assist]

Summary of Changes

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This pull request updates the timestamp conversion mechanism within the Iceberg utility class to improve how nanosecond-precision timestamps are handled when adjusting to UTC. The change ensures consistent epoch-based time calculations, facilitating internal data imports.

Highlights

• Timestamp Conversion Logic: Updated the conversion logic for timestamptz values to use ChronoUnit.NANOS for more accurate epoch-based calculations.
• Dependency Update: Imported java.time.temporal.ChronoUnit to support the new timestamp adjustment logic.

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[github-actions]

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R: @kennknowles for label java.

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