Add option to discard min transfer times

[hannesj]

Summary

Currently many GTFS feeds supply minimum transfer times for all stop-to-stop paris, which are due to eg ticketing constraints or to support legacy trip planning software, which doesn't utilize the street network for transfers. Some times we want to drop these and always use transfers from OSM instead. Add support for this via a build config flag.

Documentation

Updated

Changelog

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[leonardehrenfried]

I would prefer the graph builder modules to move towards immutability but if that is controversial then I'm happy to approve this.

[codecov-commenter]

Codecov Report

Merging #4195 (ba0a9ce) into dev-2.x (6c8f210) will increase coverage by 0.00%.
The diff coverage is 72.72%.

@@            Coverage Diff             @@
##             dev-2.x    #4195   +/-   ##
==========================================
  Coverage      48.91%   48.92%           
+ Complexity     10021    10020    -1     
==========================================
  Files           1375     1375           
  Lines          56461    56465    +4     
  Branches        6567     6567           
==========================================
+ Hits           27619    27623    +4     
+ Misses         26827    26824    -3     
- Partials        2015     2018    +3     

Impacted Files	Coverage Δ
...rg/opentripplanner/graph_builder/GraphBuilder.java	0.00% <0.00%> (ø)
...c/main/java/org/opentripplanner/gtfs/MockGtfs.java	45.65% <ø> (ø)
...g/opentripplanner/gtfs/mapping/TransferMapper.java	60.86% <50.00%> (-0.67%)	⬇️
...entripplanner/graph_builder/module/GtfsModule.java	68.26% <100.00%> (+0.79%)	⬆️
...er/gtfs/mapping/GTFSToOtpTransitServiceMapper.java	87.34% <100.00%> (+0.16%)	⬆️
...opentripplanner/standalone/config/BuildConfig.java	86.15% <100.00%> (+0.21%)	⬆️
...ripplanner/model/transfer/ConstrainedTransfer.java	80.00% <0.00%> (-3.34%)	⬇️
...g/opentripplanner/api/parameter/QualifiedMode.java	65.78% <0.00%> (-2.64%)	⬇️
...pplanner/graph_builder/module/osm/OSMDatabase.java	76.44% <0.00%> (ø)
...aph_builder/module/OsmBoardingLocationsModule.java	71.69% <0.00%> (+3.77%)	⬆️

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