feat: Support top-level pl.col autocompletion for iPython

[nameexhaustion]

This just fixes the top-level

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 80.87%. Comparing base (235ebee) to head (c11bbd1).
Report is 2 commits behind head on main.

❗ Current head c11bbd1 differs from pull request most recent head f8205a5

Please upload reports for the commit f8205a5 to get more accurate results.

Files	Patch %	Lines
py-polars/polars/functions/col.py	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17080      +/-   ##
==========================================
+ Coverage   80.86%   80.87%   +0.01%     
==========================================
  Files        1455     1455              
  Lines      191086   191088       +2     
  Branches     2723     2723              
==========================================
+ Hits       154519   154547      +28     
+ Misses      36063    36038      -25     
+ Partials      504      503       -1     

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