feat: Improved expression autocomplete for IPython, Jupyter, and Marimo

[alexander-beedie]

Closes #16933 (and #20496).

Ref: marimo-team/marimo#3302
Ref: davidhalter/jedi#2057

Thanks to some very helpful analysis by @krassowski, the exact mechanism that causes Jedi/Parso-based autocomplete (eg: as found in IPython, Jupyter, and Marimo) to fail for Polars' namespaced expression methods was identified.

With the new info in mind, I was able to craft a small workaround to solve it on our side.
"Our long national autocomplete nightmare is over..."¹ ✌️😎

(Note: everything was already fine in the major editors such as PyCharm and VSCode, as well as anything using pylance on the backend for LSP/autocomplete).

Before

IPython:

Marimo:

After

IPython:

Marimo:

Footnotes

1. Ref: the inauguration of Gerald Ford, remarks ↩

[ritchie46]

Wow! Super nice!

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 6 lines in your changes missing coverage. Please review.

Project coverage is 81.15%. Comparing base (999812e) to head (69dfa02).
Report is 19 commits behind head on main.

Files with missing lines	Patch %	Lines
py-polars/polars/expr/expr.py	33.33%	2 Missing ⚠️
py-polars/polars/series/series.py	33.33%	2 Missing ⚠️
py-polars/polars/series/struct.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #22221      +/-   ##
==========================================
+ Coverage   80.59%   81.15%   +0.55%     
==========================================
  Files        1640     1638       -2     
  Lines      236814   235253    -1561     
  Branches     2714     2714              
==========================================
+ Hits       190871   190911      +40     
+ Misses      45302    43701    -1601     
  Partials      641      641              

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