add shapes parameter to render shapes as hex/circle/square

[Sonja-Stockhaus]

Another feature from squidpy that we want to support here: the new shape argument in render_shapes() can be set to "circle", "hex" or "square" so that the shapes are converted to and redered as circles/hexagons/squares. If the argument is set to None (default), the shapes are rendered as they are.

First version of the conversion method (@timtreis up to discussion):

• from circle to square/hex: the new shape lies exactly within the original circle
• from (multi)polygon to circle: the convex hull is computed, then we take the center as the mean of the resulting points and choose the radius as the maximum of the distances between the center and every point on the convex hull
• from (multi)polygon to square/hex: chain of (multi)polygon -> circle -> square/hex

[codecov-commenter]

Codecov Report

❌ Patch coverage is 76.41509% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.40%. Comparing base (ce5a103) to head (e6e1ae2).

Files with missing lines	Patch %	Lines
src/spatialdata_plot/pl/utils.py	73.95%	25 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #474      +/-   ##
==========================================
- Coverage   83.80%   83.40%   -0.41%     
==========================================
  Files           8        8              
  Lines        1976     2079     +103     
==========================================
+ Hits         1656     1734      +78     
- Misses        320      345      +25     

Files with missing lines	Coverage Δ
src/spatialdata_plot/pl/basic.py	89.32% <100.00%> (ø)
src/spatialdata_plot/pl/render.py	92.61% <100.00%> (+0.10%)	⬆️
src/spatialdata_plot/pl/render_params.py	89.20% <100.00%> (+0.06%)	⬆️
src/spatialdata_plot/pl/utils.py	77.97% <73.95%> (-0.35%)	⬇️

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