fix(python): Fix Series.to_numpy for Array types with nulls and nested Arrays

[stinodego]

Closes #14268

Changes

• Move handling of Array types in Series.to_numpy to Rust
• Fix handling of null values (see linked issue)
• Fix handling of nested arrays

[codecov]

Codecov Report

Attention: Patch coverage is 94.84536% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 80.80%. Comparing base (15f6b36) to head (c464493).
Report is 17 commits behind head on main.

Files	Patch %	Lines
py-polars/src/series/export.rs	77.77%	4 Missing ⚠️
py-polars/src/to_numpy.rs	98.59%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16230      +/-   ##
==========================================
- Coverage   80.85%   80.80%   -0.06%     
==========================================
  Files        1394     1393       -1     
  Lines      179955   179388     -567     
  Branches     2909     2921      +12     
==========================================
- Hits       145508   144958     -550     
+ Misses      33942    33927      -15     
+ Partials      505      503       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[stinodego]

There seems to be no reason to use Series::_try_from_arrow_unchecked_with_md..

Series::from_chunks_and_dtype_unchecked preserves the data type, so it should also preserve any metadata present on that dtype.