Implement free transfers in GTFS Fares V2

[leonardehrenfried]

Summary

As a follow up of #4338 this PR implements the fare_transfer_rules.txt file from the recently added Fares V2 specification.

There are a couple of limitations though:

• only free transfers are implemented
• only tickets that cover the entire itinerary are implemented

I plan on removing these limitations in the near future.

Unit tests

Added.

cc @lslangley @christrillium

[codecov-commenter]

Codecov Report

Base: 58.55% // Head: 58.54% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (9bb7e6d) compared to base (5813e2f).
Patch coverage: 88.59% of modified lines in pull request are covered.

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #4460      +/-   ##
=============================================
- Coverage      58.55%   58.54%   -0.01%     
- Complexity     11439    11481      +42     
=============================================
  Files           1512     1516       +4     
  Lines          60089    60272     +183     
  Branches        6829     6842      +13     
=============================================
+ Hits           35185    35287     +102     
- Misses         22836    22913      +77     
- Partials        2068     2072       +4     

Impacted Files	Coverage Δ
...estFareInFreeTransferWindowFareServiceFactory.java	84.61% <0.00%> (ø)
...g/opentripplanner/ext/fares/model/FareProduct.java	50.00% <ø> (-25.00%)	⬇️
...ntripplanner/ext/fares/model/FareTransferType.java	0.00% <0.00%> (ø)
...ripplanner/graph_builder/DataImportIssueStore.java	57.57% <ø> (-1.25%)	⬇️
...entripplanner/graph_builder/module/GtfsModule.java	69.14% <0.00%> (-1.89%)	⬇️
...pentripplanner/gtfs/mapping/FareLegRuleMapper.java	45.00% <0.00%> (ø)
...ipplanner/gtfs/mapping/FareTransferRuleMapper.java	90.90% <90.90%> (ø)
...tripplanner/ext/fares/impl/GtfsFaresV2Service.java	96.46% <94.73%> (-3.54%)	⬇️
...nner/ext/fares/impl/DefaultFareServiceFactory.java	86.04% <100.00%> (+0.68%)	⬆️
...g/opentripplanner/ext/fares/model/FareLegRule.java	100.00% <100.00%> (ø)
... and 46 more

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