First try at using build events

jsonapi_extras.links.task.yml

jsonapi_extras.services.yml

modules/jsonapi_defaults/jsonapi_defaults.module

modules/jsonapi_defaults/src/Controller/EntityResource.php

...ts/tests/src/Functional/JsonApiDefaultsFunctionalTest.php

src/EventSubscriber/JsonApiBuildSubscriber.php

src/Normalizer/ResourceIdentifierNormalizer.php

src/Plugin/ResourceFieldEnhancerBase.php

src/ResourceType/ConfigurableResourceTypeRepository.php

tests/src/Functional/JsonApiExtrasFunctionalTest.php

tests/src/Kernel/EntityToJsonApiTest.php