feat: add support for JsonNode subclasses

[cromoteca]

Support for JsonNode was added recently. This PR adds the same treatment for its subclasses.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.00%. Comparing base (c02ab2e) to head (da9a187).

Additional details and impacted files

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##             main    #2537   +/-   ##
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  Coverage   95.00%   95.00%           
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  Files          66       66           
  Lines        4546     4546           
  Branches      661      661           
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  Hits         4319     4319           
  Misses        182      182           
  Partials       45       45           

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unittests	95.00% <ø> (ø)

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[platosha]

Just wondering: should we rather represent JsonObject as Record<never, never> and JsonArray as unknown[]?

[cromoteca]

I was thinking the same thing, but mostly for simple types like numbers and strings which are transmitted as they are. But I don't expect classes like IntNode to be used as service types, as you can just use int or Integer.
Concerning more complex types like the ones you mentioned, having unknown[] instead of unknown doesn't add big value to me as you still need to cast items. Representing ObjectNode as Record<never, never> shouldn't it be Record<string, unknown>? But then you still have to cast all property values.

[cromoteca]

I decided to only support the 3 non-raw-value classes, which also removes the need to use ClassGraph for discovery.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[vaadin-bot]

This ticket/PR has been released with Hilla 24.5.0.alpha4 and is also targeting the upcoming stable 24.5.0 version.