Improved sliding windows

[schrf]

Description

replaced the drop_partial_windows argument with partial_windows, adding two new options:

1. "adaptive": adjust window sizes such that all windows have almost the exact same size
2. "split": recursively split a slide into windows such that they do not exceed a maximum number of cells defined by max_nr_cells.

The old arguments are None and drop now.

How has this been tested?

Tested using imc pancreas and visium datasets, running sliding_windows with different argument combinations and visually inspecting the windows by plotting them.

Closes

closes #908

[codecov]

Codecov Report

❌ Patch coverage is 81.15942% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.37%. Comparing base (469a7d0) to head (c1fa430).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/squidpy/tl/_sliding_window.py	81.15%	7 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1116      +/-   ##
==========================================
+ Coverage   66.21%   66.37%   +0.15%     
==========================================
  Files          44       44              
  Lines        7163     7211      +48     
  Branches     1217     1230      +13     
==========================================
+ Hits         4743     4786      +43     
- Misses       1943     1945       +2     
- Partials      477      480       +3     

Files with missing lines	Coverage Δ
src/squidpy/tl/_sliding_window.py	80.74% <81.15%> (+4.87%)	⬆️

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[timtreis]

Hey @schrf, thank you for your contribution! Quite a lot of the changes are inconsequential (removing comments, renaming things, etc) which I'd guess are introduced by some LLM. While that's totally acceptable, I'd be great if you could clean up this PR to only touch things that are actually relevant to the new functionality you're implementing.

Thank you!