Add geometry for EscalatorEdge

[leonardehrenfried]

Summary

When I debugged a problem inside a station, I noticed that escalators are not shown in the new debug UI. This is because they don't have a geometry.

For this reason, this PR adds one that is generated on the fly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.84%. Comparing base (90a5ebb) to head (2eb3c19).
Report is 4 commits behind head on dev-2.x.

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6111      +/-   ##
=============================================
- Coverage      69.85%   69.84%   -0.01%     
+ Complexity     17468    17465       -3     
=============================================
  Files           1975     1975              
  Lines          74614    74615       +1     
  Branches        7640     7640              
=============================================
- Hits           52118    52117       -1     
- Misses         19848    19849       +1     
- Partials        2648     2649       +1     

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