Fix processing of one-way boarding locations

[leonardehrenfried]

Summary

It fixes a problem where invalid OSM platform data would crash the graph build.

In order to have more precise tests that only test individual OSM ways rather than a whole area, I extracted an interface for OsmProvider and added a test implementation. This makes it much easier to write tests that don't need to load OSM data from disk.

Issue

Closes #6387
Closes #6388

Unit tests

Lots added.

Documentation

Javadoc.

[codecov]

Codecov Report

Attention: Patch coverage is 79.16667% with 15 lines in your changes missing coverage. Please review.

Project coverage is 69.84%. Comparing base (0c8c3b2) to head (b3623d1).
Report is 9 commits behind head on dev-2.x.

Files with missing lines	Patch %	Lines
...va/org/opentripplanner/osm/DefaultOsmProvider.java	75.43%	13 Missing and 1 partial ⚠️
...ripplanner/graph_builder/module/osm/OsmModule.java	87.50%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6410      +/-   ##
=============================================
+ Coverage      69.79%   69.84%   +0.05%     
- Complexity     18092    18129      +37     
=============================================
  Files           2064     2069       +5     
  Lines          77209    77271      +62     
  Branches        7859     7856       -3     
=============================================
+ Hits           53888    53972      +84     
+ Misses         20566    20544      -22     
  Partials        2755     2755              

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