Support polars Datetime with timezone types in cudf_polars

[mroeschke]

Description

This PR does not necessarily support Polars expressions that manipulate timezone information but ensure we can consume and return Polars Datetime types with a time_zone.

We'll need to preserve the timezone name in the column_metadata struct in order to pass it to the Arrow schema generated by nanoarrow.

Checklist

• [ ] I am familiar with the Contributing Guidelines.
• [ ] New or existing tests cover these changes.
• [ ] The documentation is up to date with these changes.

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[vyasr]

@mroeschke this PR has some test failures that need addressing.

[mroeschke]

@mroeschke this PR has some test failures that need addressing.

Yes, I think the Polars unit tests failures will be address once https://github.com/rapidsai/cudf/pull/19193 is merged

[mroeschke]

@vyasr the failures have been resolved

[mroeschke]

/merge