ENH: support geopandas objects in distance statistics

[martinfleis]

A simple change that allows us to pass geopandas objects directly onto Ripley's functions without a need of extracting the underlying array of coordinates.

This is a part of #135 that does not need me to learn the dispatch thingy :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.9%. Comparing base (4ecafc6) to head (ef72770).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #145     +/-   ##
=======================================
+ Coverage   69.7%   69.9%   +0.2%     
=======================================
  Files         12      12             
  Lines       1775    1785     +10     
=======================================
+ Hits        1237    1247     +10     
  Misses       538     538             

Files	Coverage Δ
pointpats/distance_statistics.py	83.0% <100.0%> (+0.8%)	⬆️

[knaaptime]

wow, that was easy. neat.