refactor(python): Expose IEJoin IR node to python

[wence-]

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[codecov]

Codecov Report

Attention: Patch coverage is 38.46154% with 24 lines in your changes missing coverage. Please review.

Project coverage is 79.79%. Comparing base (f55658b) to head (1bc6cef).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
...rates/polars-python/src/lazyframe/visitor/nodes.rs	46.66%	16 Missing ⚠️
.../polars-python/src/lazyframe/visitor/expr_nodes.rs	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19104      +/-   ##
==========================================
+ Coverage   79.77%   79.79%   +0.01%     
==========================================
  Files        1531     1531              
  Lines      208529   208595      +66     
  Branches     2913     2913              
==========================================
+ Hits       166347   166438      +91     
+ Misses      41631    41606      -25     
  Partials      551      551              

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