Enhancement

Today there is an option to provide custom annotationIntrospector to the Jackson2ObjectMapperBuilder via Jackson2ObjectMapperBuilderCustomizer:

    @Bean
    public Jackson2ObjectMapperBuilderCustomizer myCustomizer() {
        return jacksonObjectMapperBuilder -> jacksonObjectMapperBuilder.annotationIntrospector(new MyIntrospector());
    }

However, in that way I'm replacing existing introspector. So if some other introspectors were added by some libs - they will be just lost and today there seems to be no option to extend existing ones instead.

Would be good to adjust org.springframework.http.converter.json.Jackson2ObjectMapperBuilder to either provide some way to get currently configured annotationIntrospector (so that I can use something like AnnotationIntrospector.pair to combine it with mine) or to have some other way to add new introspector to current one instead of replacing it.