feat: Add time_zone to Datetime column

[dfrankland]

Motivation

Closes #32

Changes

allows setting a time zone for datetimes and checking if the values in the column matches it

Pertinent polars docs:
https://docs.pola.rs/user-guide/transformations/time-series/timezones/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (08972c6) to head (29b10f8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #33   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           39        39           
  Lines         1887      1890    +3     
=========================================
+ Hits          1887      1890    +3     

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[AndreasAlbertQC]

Thanks for the nice PR @dfrankland! Could you add a test in test_sql_schema.py for the oracle part?

[borchero]

Thanks for the initiative @dfrankland, I think this is a very useful addition! :)

[dfrankland]

Let me know if you'd like for me to rebase these changes

[borchero]

All right, nice, I think we're almost there! :)

[dfrankland]

Updated to keep things minimal and also made the test name more accurate

[borchero]

Thank you for the updates! Just one tiny comment left :)

[borchero]

I quickly took care of the small remaining comments to finally merge this -- thanks for your work @dfrankland!

[dfrankland]

@borchero not a problem at all, thank you!