Initialize RAPTOR stop-to-stop transfers on server startup

[flaktack]

Summary

The runtime configuration is modified so that a list of RouteRequests may be specified to calculate stop-to-stop transfers before the server is ready to serve requests.

1. router-config.json is extended with a new field, transferCacheRequests. The RouteRequest configured in routingDefaults is the default for the items in transferCacheRequests.
2. the items in transferCacheRequests are used to initialize RaptorRequestTransferCache.

{
  "transit": {
    "transferCacheRequests": [
      { "modes": "WALK"                                                     },
      { "modes": "WALK",    "wheelchairAccessibility": { "enabled": true  } }
    ]
  }
}

Adding items to transferCacheRequests increases the server startup time with considerable CPU usage. If automatic scaling is configured based on CPU usage, the longer startup times should be considered.

Issue

closes #4973

Unit tests

Documentation

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Changelog

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Bumping the serialization version id

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[codecov]

Codecov Report

Patch coverage: 73.68% and project coverage change: +0.06 🎉

Comparison is base (6baa4b0) 64.08% compared to head (4edec8c) 64.14%.

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #4977      +/-   ##
=============================================
+ Coverage      64.08%   64.14%   +0.06%     
- Complexity     13593    13621      +28     
=============================================
  Files           1676     1676              
  Lines          66288    66456     +168     
  Branches        7154     7164      +10     
=============================================
+ Hits           42480    42630     +150     
- Misses         21429    21441      +12     
- Partials        2379     2385       +6     

Impacted Files	Coverage Δ
...va/org/opentripplanner/ext/siri/SiriHttpUtils.java	0.00% <0.00%> (ø)
...i/updater/SiriETGooglePubsubUpdaterParameters.java	43.75% <ø> (+2.57%)	⬆️
...r/ext/siri/updater/SiriETHttpTripUpdateSource.java	0.00% <0.00%> (ø)
...pentripplanner/ext/siri/updater/SiriETUpdater.java	0.00% <0.00%> (ø)
...t/siri/updater/azure/AbstractAzureSiriUpdater.java	0.00% <0.00%> (ø)
...ri/updater/azure/SiriAzureETUpdaterParameters.java	66.66% <ø> (ø)
...siri/updater/azure/SiriAzureUpdaterParameters.java	68.00% <ø> (ø)
...raptoradapter/transit/TransitTuningParameters.java	58.33% <0.00%> (-5.31%)	⬇️
...pplanner/updater/trip/MqttGtfsRealtimeUpdater.java	0.00% <0.00%> (ø)
...pdater/trip/MqttGtfsRealtimeUpdaterParameters.java	0.00% <ø> (ø)
... and 12 more

... and 16 files with indirect coverage changes

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[leonardehrenfried]

@Bartosz-Kruba Since this is a feature that you're interested in, could you please review this?

[leonardehrenfried]

Can you please resolve the conflicts?

[jtorin]

Are these configuration changes relevant to the implementation?

[t2gran]

I think we want these changes - look at it as clen-up, not relevant, but indeed welcome.

[flaktack]

It is required due to this change:

a95253a#diff-4694584dc4047e7a37434a4b1dcc131e4c40470f737bf21eb222b7180de2fdf8L61-R61

router-config.json is parsed when creating the documentation. Since the values in RouteRequest are now copied from the default request (due to using clone()) parsing transferCacheRequests modifies the stored default values for the documentation. routingDefaults was updated to the default values due to this.

[flaktack]

It seems the changes are not needed anymore, I've removed them.

[t2gran]

@flaktack can you cherry-pick this commit into this: 9376488

I have linked to the RouteRequest.md doc instead of inlining it in the Router doc.