ENH: support shapely polygon as enclosures limit

[martinfleis]

Closes #254

[codecov]

Codecov Report

Merging #299 (cc47c62) into main (8280c3d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #299   +/-   ##
=======================================
  Coverage   95.70%   95.70%           
=======================================
  Files          13       13           
  Lines        2792     2794    +2     
=======================================
+ Hits         2672     2674    +2     
  Misses        120      120           

Impacted Files	Coverage Δ
momepy/elements.py	96.64% <100.00%> (+0.02%)	⬆️

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