Handle alerts for stations

[miklcct]

Summary

Handle alerts for stations in GTFS-RT and the corresponding API

Issue

Fixes #6120

In particular, this should achieve the following from the GTFS GraphQL API:

• Loading alerts for a station should return all alerts for that station in the GTFS-RT feed.
• Loading alerts for a stop should return alerts for that stop, and for the parent station in the GTFS-RT feed.
• Leg alerts for public transport will also include alerts for the stations used in the leg.

Unit tests

Integration tests are added into the GTFS GraphQL API

Documentation

None

Changelog

Needed

Bumping the serialization version id

Not needed

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (dev-2.x@27cb855). Learn more about missing BASE report.
⚠️ Report is 14 commits behind head on dev-2.x.

Files with missing lines	Patch %	Lines
...pis/gtfs/datafetchers/AlertEntityTypeResolver.java	0.00%	0 Missing and 1 partial ⚠️
...ntripplanner/apis/gtfs/datafetchers/AlertImpl.java	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             dev-2.x    #6750   +/-   ##
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  Coverage           ?   71.87%           
  Complexity         ?    19132           
==========================================
  Files              ?     2074           
  Lines              ?    77763           
  Branches           ?     7936           
==========================================
  Hits               ?    55890           
  Misses             ?    19064           
  Partials           ?     2809           

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[leonardehrenfried]

My first gut feeling is that this is the correct thing to do, but does the spec explicity talk about this?

[miklcct]

My first gut feeling is that this is the correct thing to do, but does the spec explicity talk about this?

The spec does not limit the application of alerts to platforms / stations / corridors / entrances / etc. For example, you can set the affected entity to reference a stop_id which represents an entrance, and our TransitAlertService doesn't have such limitation as well (it does not have referential integrity).

In particular, "Loading alerts for a stop should return alerts for that stop, and for the parent station in the GTFS-RT feed." is open to discussion but there has already been a TODO for years in the code which I have been completed.

Also, I would like a reviewer on SIRI as well as I am not familiar to how multi-modal station works there.