Add tracing tags for headers and query parameters to GTFS API

[VillePihlava]

Summary

This PR adds the ability to configure tracing tags for headers and query parameters in the GTFS API. This is enabled with a router config field.

Issue

N/A

Unit tests

Small changes to existing unit tests

Documentation

Javadoc and other documentation added

[VillePihlava]

In tomorrows dev meeting we should discuss if the header and query parameter tags should come from the same config field or be separate.

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 35 lines in your changes missing coverage. Please review.

Project coverage is 71.77%. Comparing base (4738e85) to head (b4de1da).
Report is 29 commits behind head on dev-2.x.

Files with missing lines	Patch %	Lines
...org/opentripplanner/apis/support/TracingUtils.java	0.00%	18 Missing ⚠️
.../org/opentripplanner/apis/gtfs/GtfsGraphQLAPI.java	0.00%	12 Missing ⚠️
...opentripplanner/apis/transmodel/TransmodelAPI.java	0.00%	2 Missing ⚠️
...anner/standalone/config/sandbox/GtfsApiConfig.java	91.66%	1 Missing ⚠️
...andalone/configure/ConstructApplicationModule.java	0.00%	1 Missing ⚠️
...standalone/server/DefaultServerRequestContext.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6712      +/-   ##
=============================================
- Coverage      71.78%   71.77%   -0.02%     
- Complexity     19061    19065       +4     
=============================================
  Files           2064     2066       +2     
  Lines          77679    77713      +34     
  Branches        7919     7921       +2     
=============================================
+ Hits           55759    55775      +16     
- Misses         19099    19119      +20     
+ Partials        2821     2819       -2     

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