add vehicleRentalStationsByBbox query to gtfs graqphql schema

[JustCris654]

Summary

Add vehicleRentalStationsByBbox query to gtfs graphql schema

Unit tests

• Was any manual verification done? I tested the graqhql query with the graphiql frontend
• Do all tests
  pass the continuous integration service
  ? Yes

Documentation

I added the proper comments in the schema.graphqls file

[codecov]

Codecov Report

Attention: Patch coverage is 2.94118% with 33 lines in your changes missing coverage. Please review.

Project coverage is 69.87%. Comparing base (559fac5) to head (35daa0f).

Files with missing lines	Patch %	Lines
...ntripplanner/apis/gtfs/generated/GraphQLTypes.java	0.00%	19 Missing ⚠️
...pplanner/apis/gtfs/datafetchers/QueryTypeImpl.java	6.66%	14 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6186      +/-   ##
=============================================
- Coverage      69.90%   69.87%   -0.03%     
- Complexity     17722    17723       +1     
=============================================
  Files           1998     1998              
  Lines          75443    75477      +34     
  Branches        7718     7719       +1     
=============================================
+ Hits           52739    52741       +2     
- Misses         20025    20057      +32     
  Partials        2679     2679              

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