Add support for groupOfLines in top level Transmodel API [changelog skip]

[hannesj]

Summary

Add support for groupOfLines in top level Transmodel API, both for querying a single and all groups. Also, add possibility to fetch all lines part of a group.

[leonardehrenfried]

Even though you still have to merge with master, I will approve this.

[codecov-commenter]

Codecov Report

Merging #4232 (8fa8b7c) into dev-2.x (deb53dc) will decrease coverage by 0.00%.
The diff coverage is 65.90%.

@@              Coverage Diff              @@
##             dev-2.x    #4232      +/-   ##
=============================================
- Coverage      56.63%   56.63%   -0.01%     
+ Complexity     10509    10507       -2     
=============================================
  Files           1398     1398              
  Lines          57107    57150      +43     
  Branches        6645     6647       +2     
=============================================
+ Hits           32344    32366      +22     
- Misses         22744    22763      +19     
- Partials        2019     2021       +2     

Impacted Files	Coverage Δ
...planner/transit/service/DefaultTransitService.java	24.67% <0.00%> (-1.01%)	⬇️
.../org/opentripplanner/routing/graph/GraphIndex.java	76.08% <30.00%> (-4.39%)	⬇️
...ner/ext/transmodelapi/TransmodelGraphQLSchema.java	65.81% <82.60%> (+0.49%)	⬆️
.../transmodelapi/model/network/GroupOfLinesType.java	95.83% <87.50%> (-1.67%)	⬇️
...g/opentripplanner/api/parameter/QualifiedMode.java	65.78% <0.00%> (-2.64%)	⬇️
...ph_builder/module/ned/MissingElevationHandler.java	93.70% <0.00%> (-1.58%)	⬇️
...pplanner/graph_builder/module/osm/OSMDatabase.java	76.73% <0.00%> (-0.94%)	⬇️
...aph_builder/module/OsmBoardingLocationsModule.java	71.69% <0.00%> (+3.77%)	⬆️

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