extend 'walk' filter for separately mapped sidewalks

[winnewoerp]

Solves #1253 (extended walk filter for separately mapped sidewalks). Description and code example can be found in the issue description.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.44%. Comparing base (4ac5752) to head (70ed467).
Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1254   +/-   ##
=======================================
  Coverage   98.44%   98.44%           
=======================================
  Files          24       24           
  Lines        2384     2384           
=======================================
  Hits         2347     2347           
  Misses         37       37           

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[gboeing]

Thanks!