feat(python): Enable generating data with time zones in parametric testing

[stinodego]

Changes

• Add allow_time_zones parameter to series/dataframes/dtypes strategies. It's enabled by default.

Note that I'm avoiding the Datetime(time_zone="*") notation here because it's problematic in a number of ways. Instantiated data types should represent one specific data type, not match a whole bunch of data types. Unfortunately that does mean we have no good way to enable/disable time zones using allowed_dtypes/excluded_dtypes parameters, so I'm going with a separate parameter for this one.

[stinodego]

Feels like we need a helper class at this point. Will probably refactor in the future.

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 80.78%. Comparing base (11fe9d8) to head (748dade).
Report is 12 commits behind head on main.

Files	Patch %	Lines
...olars/polars/testing/parametric/strategies/data.py	88.23%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16298      +/-   ##
==========================================
- Coverage   80.80%   80.78%   -0.02%     
==========================================
  Files        1393     1393              
  Lines      179406   179375      -31     
  Branches     2921     2925       +4     
==========================================
- Hits       144971   144917      -54     
- Misses      33932    33955      +23     
  Partials      503      503              

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