docs(python): Properly expose InProcessQuery in docs, mark as unstable

[stinodego]

Also remove the top-level re-export. It doesn't need to be re-exported because users do not instantiate it themselves. Similar to GroupBy.

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 80.87%. Comparing base (8a6bf4b) to head (a00dc17).

Files	Patch %	Lines
py-polars/polars/lazyframe/in_process.py	0.00%	5 Missing ⚠️
py-polars/polars/lazyframe/frame.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17097      +/-   ##
==========================================
+ Coverage   80.86%   80.87%   +0.01%     
==========================================
  Files        1456     1456              
  Lines      191141   191141              
  Branches     2728     2728              
==========================================
+ Hits       154562   154584      +22     
+ Misses      36073    36051      -22     
  Partials      506      506              

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[ritchie46]

Oh, I made the docs, but never exposed them? :')

[stinodego]

Oh, I made the docs, but never exposed them? :')

Yep 😅