Implement hashCode for Money class

[leonardehrenfried]

Summary

I found a rather embarrassing bug where the vehicle parking updater would randomly add and remove parking lots. This was due to the fact that equals and hashCode in VehicleParking were not symetric.

I traced it down to Money not having implemented hashCode. 😳

Unit tests

✔️

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.86%. Comparing base (ad49e64) to head (bbbe74c).
Report is 11 commits behind head on dev-2.x.

Additional details and impacted files

@@            Coverage Diff             @@
##             dev-2.x    #5801   +/-   ##
==========================================
  Coverage      67.86%   67.86%           
- Complexity     16547    16548    +1     
==========================================
  Files           1908     1908           
  Lines          72339    72340    +1     
  Branches        7442     7442           
==========================================
+ Hits           49094    49095    +1     
- Misses         20723    20724    +1     
+ Partials        2522     2521    -1     

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