Add ability to disable DefaultJacksonJaxbJsonProvider

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.

Start by locating the registration block containing DefaultJacksonJaxbJsonProvider and inspect how existing configuration controls provider registration. Define a configuration option that prevents the default provider from being registered, then verify that the provider is absent when disabled while existing registration behavior remains unchanged.

Written by the indexing model from the issue text.