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 78.68852% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.35%. Comparing base (469a7d0) to head (d579f47).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/squidpy/tl/_sliding_window.py	78.68%	7 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1116      +/-   ##
==========================================
+ Coverage   66.21%   66.35%   +0.13%     
==========================================
  Files          44       44              
  Lines        7163     7207      +44     
  Branches     1217     1230      +13     
==========================================
+ Hits         4743     4782      +39     
- Misses       1943     1945       +2     
- Partials      477      480       +3     

Files with missing lines	Coverage Δ
src/squidpy/tl/_sliding_window.py	80.15% <78.68%> (+4.29%)	⬆️

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