Add ability to disable DefaultJacksonJaxbJsonProvider

[marekkrk]

Currently JAXB provider is always registered unless Jackson's JAXB provider is already registered.

` if (!config.isRegistered(JacksonJaxbJsonProvider.class)) {

        if (registerExceptionMappers) {
            // add the default Jackson exception mappers
            context.register(JsonParseExceptionMapper.class);
            context.register(JsonMappingExceptionMapper.class);
        }

        if (EntityFilteringFeature.enabled(config)) {
            context.register(JacksonFilteringFeature.class);
            context.register(FilteringJacksonJaxbJsonProvider.class, MessageBodyReader.class, MessageBodyWriter.class);
        } else {
            context.register(DefaultJacksonJaxbJsonProvider.class, MessageBodyReader.class, MessageBodyWriter.class);
        }
    }

`

This behaviour should be configurable so that DefaultJacksonJaxbJsonProvider does not need to be present in native Graal images.

[jansupol]

Currently JAXB provider is always registered unless Jackson's JAXB provider is already registered. This behaviour should be configurable so that DefaultJacksonJaxbJsonProvider does not need to be present in native Graal images.

Do I understand correctly that you disable (javax.xml.bind) JAX-B by bringing in Jackson?