ORCA Fares: Add free cash transfers for Kitsap transit

[daniel-heppner-ibigroup]

Summary

Kitsap Transit allows cash users to have free transfers. This modification to the fare module allows us to keep track of cash transfer value per-agency instead of only for the itinerary as a whole.

Unit tests

The tests were modified to check the Kitsap cash transfer policy and to ensure that it doesn't collide with KC Metro cash transfers.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.91%. Comparing base (0859b64) to head (e33d710).
Report is 3 commits behind head on dev-2.x.

Additional details and impacted files

@@            Coverage Diff             @@
##             dev-2.x    #5826   +/-   ##
==========================================
  Coverage      67.90%   67.91%           
+ Complexity     16567    16559    -8     
==========================================
  Files           1910     1910           
  Lines          72418    72436   +18     
  Branches        7444     7447    +3     
==========================================
+ Hits           49173    49192   +19     
  Misses         20724    20724           
+ Partials        2521     2520    -1     

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[leonardehrenfried]

Since this is a sandbox-only PR I used my admin rights to merge with a single review.