Add field 'routingErrors' to LegacyGraphQLAPI

[joonaojapalo]

Summary

With current errors given by LegacyGraphQLAPI, it's not possible to know if eg. geocoding issue is related to fromPlace or toPlace (or intermediate point). This PR adds list field routingErrors to LegacyGraphQLAPI's Plan type as in Transmodel API.

As OTP2 currently doesn't support routing via intermediate places, intermediate point errors are mapped for destination (InputField.to).

Unit tests

• Test suite passes.

Documentation

• Documentation from Transmodel API copied to LegacyGraphQLAPI's schema.graphqls.

[leonardehrenfried]

Use upper case for enums.

[codecov-commenter]

Codecov Report

Merging #4253 (76e3d28) into dev-2.x (25a88c0) will increase coverage by 0.02%.
The diff coverage is 16.66%.

@@              Coverage Diff              @@
##             dev-2.x    #4253      +/-   ##
=============================================
+ Coverage      56.85%   56.88%   +0.02%     
- Complexity     10587    10591       +4     
=============================================
  Files           1402     1405       +3     
  Lines          57310    57287      -23     
  Branches        6649     6619      -30     
=============================================
+ Hits           32585    32587       +2     
+ Misses         22703    22696       -7     
+ Partials        2022     2004      -18     

Impacted Files	Coverage Δ
...anner/ext/legacygraphqlapi/LegacyGraphQLUtils.java	0.00% <0.00%> (ø)
...raphqlapi/generated/LegacyGraphQLDataFetchers.java	0.00% <ø> (ø)
...legacygraphqlapi/generated/LegacyGraphQLTypes.java	0.00% <0.00%> (ø)
...pi/datafetchers/LegacyGraphQLRoutingErrorImpl.java	66.66% <66.66%> (ø)
...anner/ext/legacygraphqlapi/LegacyGraphQLIndex.java	69.89% <100.00%> (+0.32%)	⬆️
...graphqlapi/datafetchers/LegacyGraphQLPlanImpl.java	31.11% <100.00%> (+1.56%)	⬆️
...a/org/opentripplanner/util/NonLocalizedString.java	64.70% <0.00%> (-5.89%)	⬇️
...anner/graph_builder/linking/FlexLocationAdder.java	69.23% <0.00%> (-5.77%)	⬇️
.../graph_builder/module/DirectTransferGenerator.java	82.89% <0.00%> (-3.78%)	⬇️
.../calendar/impl/CalendarServiceDataFactoryImpl.java	87.67% <0.00%> (-2.23%)	⬇️
... and 130 more

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