warning and optimization

[gboeing]

This PR:

• optimizes the _make_overpass_polygon_coord_strs function with some refactoring
• warns user if the geometry (boundary area) is much larger than max query area size because this can cause slow performance a) during quadrat cutting to subdivide the geometry, and b) during Overpass downloading because OSMnx must make many requests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d61a218) 97.84% compared to head (3a2aac4) 97.92%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1101      +/-   ##
==========================================
+ Coverage   97.84%   97.92%   +0.07%     
==========================================
  Files          28       28              
  Lines        2506     2505       -1     
==========================================
+ Hits         2452     2453       +1     
+ Misses         54       52       -2     

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