Expose route sort order in GTFS API

[leonardehrenfried]

Summary

@fpurcell has requested that we parse the GTFS field route_sort_order and expose it in the API. It turns out that we already have it in the internal model and I only needed to implement the second part.

While I was there I did bit of validation and clean up.

Issue

Closes #5763

Unit tests

Added.

Documentation

Javadoc

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.81%. Comparing base (92c1264) to head (1d330b0).
Report is 39 commits behind head on dev-2.x.

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #5764      +/-   ##
=============================================
+ Coverage      67.78%   67.81%   +0.02%     
- Complexity     16521    16531      +10     
=============================================
  Files           1904     1906       +2     
  Lines          72269    72275       +6     
  Branches        7438     7443       +5     
=============================================
+ Hits           48990    49013      +23     
+ Misses         20761    20742      -19     
- Partials        2518     2520       +2     

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[binh-dam-ibigroup]

@fpurcell has requested that we parse the GTFS field route_sort_order and expose it in the API. It turns out that we already have it in the internal model and I only needed to implement the second part.

@leonardehrenfried Cool, it will be useful for folks working on the mobile app too.

[leonardehrenfried]

@binh-dam-ibigroup Would you be available to review this?

[binh-dam-ibigroup]

@binh-dam-ibigroup Would you be available to review this?

Sure!

[binh-dam-ibigroup]

Clean and works as indicated. Just two minor non-code tweaks.