TST: convert unittests to pytest

[martinfleis]

Closes #595

Mostly done automagically using pytestify with some of manual fixes. I also occasionally sorted imports with ruff and changed Test_Rook to TestRook to make ruff happy but not consistently.

I have removed all optional skips based on missing pandas, geopandas or shapely since all are hard dependencies now.

[codecov]

Codecov Report

Merging #601 (9805c84) into main (1689fcc) will increase coverage by 83.9%.
The diff coverage is 97.6%.

@@           Coverage Diff           @@
##           main    #601      +/-   ##
=======================================
+ Coverage      0   83.9%   +83.9%     
=======================================
  Files         0     127     +127     
  Lines         0   14804   +14804     
=======================================
+ Hits          0   12420   +12420     
- Misses        0    2384    +2384     

Files	Coverage Δ
libpysal/cg/ops/tests/test_accessors.py	100.0% <100.0%> (ø)
libpysal/cg/ops/tests/test_tabular.py	100.0% <100.0%> (ø)
libpysal/cg/tests/test_ashapes.py	97.4% <100.0%> (ø)
libpysal/cg/tests/test_geoJSON.py	100.0% <100.0%> (ø)
libpysal/cg/tests/test_locators.py	100.0% <100.0%> (ø)
libpysal/cg/tests/test_polygonQuadTreeStructure.py	100.0% <100.0%> (ø)
libpysal/cg/tests/test_rtree.py	100.0% <100.0%> (ø)
libpysal/cg/tests/test_segmentLocator.py	100.0% <100.0%> (ø)
libpysal/cg/tests/test_sphere.py	100.0% <100.0%> (ø)
libpysal/cg/tests/test_voronoi.py	100.0% <100.0%> (ø)
... and 41 more

... and 76 files with indirect coverage changes

[jGaboardi]

I also occasionally sorted imports with ruff and changed Test_Rook to TestRook to make ruff happy but not consistently.

So are we OK with underscored class names for now or in general? I have no problem with "for now," especially not in this PR, but probably we'll want to take care of that soon. And I can loop that in with #589.

[martinfleis]

I'd change private bits like tests. We can have a discussion about public but I would probably keep those intact to avoid unnecessary deprecations.

[jGaboardi]

Agreed.

[jGaboardi]

@martinfleis Absolutely amazing. Never heard of pytestify.

[martinfleis]

Never heard of pytestify.

Neither did I until today 😄. It is not perfect but goes a long way.