add stopPositionInPattern in Stoptime in GTFS GraphQL API

[miklcct]

Summary

Add stopIndex in Stoptime model in GTFS GraphQL API.

The purpose of this field is to find the absolute position in a pattern, such as in conjunction with the pattern in Stop.stoptimesForPatterns.

Although the stopIndex field is used as the current implementation, it is considered an implementation detail, and this fetcher must return 0 to n-1 regardless of the implementation detail.

Issue

Closes #6026

Unit tests

The fetcher code is not tested at all and is untestable, but if possible the fetcher should be tested to always return 0 to n-1.

Documentation

Added in GraphQL.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.72%. Comparing base (ee53e50) to head (bb653bc).
Report is 145 commits behind head on dev-2.x.

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6204      +/-   ##
=============================================
- Coverage      69.91%   69.72%   -0.19%     
+ Complexity     17736    17669      -67     
=============================================
  Files           2006     2007       +1     
  Lines          75526    75648     +122     
  Branches        7730     7741      +11     
=============================================
- Hits           52804    52749      -55     
- Misses         20036    20185     +149     
- Partials        2686     2714      +28     

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[optionsome]

Use this new field in some integration test(s).