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.

[codecov[bot]]

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 :warning:

Additional details and impacted files

```diff @@ 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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