Adding situation-version to TransmodelGraphQL API

[lassetyr]

Summary

Exposes the version-field from a SIRI SX-message in the TransmodelGraphQL-api - if it exists.

[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (8520a1a) 67.45% compared to head (97cf60c) 67.46%.
Report is 50 commits behind head on dev-2.x.

Files	Patch %	Lines
...ntripplanner/ext/siri/SiriAlertsUpdateHandler.java	0.00%	1 Missing and 1 partial ⚠️
...entripplanner/routing/alertpatch/TransitAlert.java	33.33%	2 Missing ⚠️
...lanner/routing/alertpatch/TransitAlertBuilder.java	33.33%	2 Missing ⚠️
...ripplanner/raptor/api/response/RaptorResponse.java	50.00%	0 Missing and 1 partial ⚠️
.../algorithm/raptoradapter/router/TransitRouter.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             dev-2.x    #5592   +/-   ##
==========================================
  Coverage      67.45%   67.46%           
+ Complexity     16195    16189    -6     
==========================================
  Files           1858     1862    +4     
  Lines          71130    71199   +69     
  Branches        7409     7403    -6     
==========================================
+ Hits           47984    48031   +47     
- Misses         20669    20677    +8     
- Partials        2477     2491   +14     

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[leonardehrenfried]

Please document the nullablity.