Add support for via coordinates in accesses and egresses

[optionsome]

Summary

Previously via visit locations had to be between transit legs. This pr allows them to be also in accesses or egresses.

Built on top of #7105

Issue

Relates to #4887

Unit tests

TODO

Documentation

Not needed

Changelog

From title

[codecov]

Codecov Report

❌ Patch coverage is 32.66667% with 303 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.10%. Comparing base (96ca627) to head (8904323).

Files with missing lines	Patch %	Lines
...oradapter/router/street/ViaAccessEgressRouter.java	0.00%	133 Missing ⚠️
...oradapter/router/street/ViaDirectStreetRouter.java	0.00%	115 Missing ⚠️
.../opentripplanner/routing/impl/GraphPathFinder.java	54.54%	8 Missing and 2 partials ⚠️
...r/routing/algorithm/mapping/ItinerariesHelper.java	12.50%	7 Missing ⚠️
...aptoradapter/router/street/DirectStreetRouter.java	80.00%	3 Missing and 3 partials ⚠️
...entripplanner/apis/gtfs/datafetchers/StopImpl.java	0.00%	4 Missing ⚠️
...src/main/java/org/opentripplanner/astar/AStar.java	0.00%	4 Missing ⚠️
...apter/router/street/AccessEgressRouterFactory.java	25.00%	2 Missing and 1 partial ⚠️
...pentripplanner/routing/graphfinder/NearbyStop.java	78.57%	2 Missing and 1 partial ⚠️
...rg/opentripplanner/visualizer/GraphVisualizer.java	0.00%	3 Missing ⚠️
... and 10 more

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #7239      +/-   ##
=============================================
- Coverage      71.29%   71.10%   -0.19%     
- Complexity     21217    21234      +17     
=============================================
  Files           2365     2371       +6     
  Lines          87770    88054     +284     
  Branches        8686     8703      +17     
=============================================
+ Hits           62574    62612      +38     
- Misses         22183    22430     +247     
+ Partials        3013     3012       -1     

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