Add group priority to direct search

[t2gran]

Summary

The transit-group-priority feature calculate a c2 value. This is currently only done in the Raptor search, not in the AStar street search. We need this in the itinerary filters to make a fare comparison. Most street-only itineraries should just have the baseGroup applied, but FLEX should have the value calculated based on the FLEX trip.

This PR changes the transit-group-priority service so it can be used to apply the c2 value on any itinerary. The value is added, in not present, right before the itinerary filtering is performed.

Issue

This is a prerequisite for #5919

Unit tests

✅ This is mostly refactoring the code so it can be used in the RoutingWorker in addition to Rator. So there is very little new business logic.

Documentation

✅ JavaDoc is updated

Changelog

🟥 This is improving a feature developed in this release.

Bumping the serialization version id

🟥 There should no be any changes to the serialized graph.

[codecov]

Codecov Report

Attention: Patch coverage is 85.20710% with 25 lines in your changes missing coverage. Please review.

Project coverage is 69.46%. Comparing base (2a5c8be) to head (364d33e).
Report is 9 commits behind head on dev-2.x.

Files	Patch %	Lines
...iority/TransitGroupPriorityItineraryDecorator.java	26.31%	13 Missing and 1 partial ⚠️
...ork/grouppriority/TransitGroupPriorityService.java	92.00%	3 Missing and 1 partial ⚠️
...xt/reportapi/model/TransitGroupPriorityReport.java	0.00%	2 Missing ⚠️
...network/grouppriority/TransitGroupPriority32n.java	0.00%	2 Missing ⚠️
...java/org/opentripplanner/model/plan/Itinerary.java	97.77%	0 Missing and 1 partial ⚠️
...oradapter/transit/mappers/RaptorRequestMapper.java	0.00%	1 Missing ⚠️
.../transit/model/network/grouppriority/Matchers.java	95.45%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #5945      +/-   ##
=============================================
+ Coverage      69.45%   69.46%   +0.01%     
- Complexity     17070    17090      +20     
=============================================
  Files           1937     1942       +5     
  Lines          73692    73749      +57     
  Branches        7540     7548       +8     
=============================================
+ Hits           51184    51232      +48     
- Misses         19880    19889       +9     
  Partials        2628     2628              

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[leonardehrenfried]

I only found a tiny spelling mistake. Otherwise this is - as always - very clean.