Remove unwanted dependencies in Raptor code

[t2gran]

Summary

A few small cleanup tasks to Raptor to prepare for making it a separate Maven module.

Issue

Part of: #6155

Unit tests

This only contains simple refactorings, no tests added or changed.

Documentation

No

Changelog

No

Bumping the serialization version id

Not needed

[codecov]

Codecov Report

Attention: Patch coverage is 57.89474% with 16 lines in your changes missing coverage. Please review.

Project coverage is 69.92%. Comparing base (f49ad47) to head (87cbb05).
Report is 107 commits behind head on dev-2.x.

Files with missing lines	Patch %	Lines
...opentripplanner/raptor/configure/RaptorConfig.java	60.00%	3 Missing and 1 partial ⚠️
.../config/routerconfig/RaptorEnvironmentFactory.java	42.85%	3 Missing and 1 partial ⚠️
...anner/raptor/service/RangeRaptorDynamicSearch.java	0.00%	3 Missing ⚠️
...nner/standalone/config/configure/ConfigModule.java	0.00%	3 Missing ⚠️
...pplanner/raptor/api/request/RaptorEnvironment.java	75.00%	1 Missing ⚠️
...er/raptor/service/ViaRangeRaptorDynamicSearch.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6163      +/-   ##
=============================================
+ Coverage      69.90%   69.92%   +0.01%     
- Complexity     17700    17729      +29     
=============================================
  Files           1996     1998       +2     
  Lines          75305    75406     +101     
  Branches        7705     7718      +13     
=============================================
+ Hits           52644    52727      +83     
- Misses         19990    20000      +10     
- Partials        2671     2679       +8     

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