Spring Revisit Jackson support

Spring Framework 7 should be the opportunity for a revision of Jackson support.

That involves: - Adding support for Jackson 3 which should use a new package (com.fasterxml -> tools.jackson) and new artifact coordinates if it is released on time. - Decide if we deprecate or not Jackson 2 support - Switch Jackson 3 HTTP converters to SmartHttpMessageConverter - Evaluate if we can implement a Jackson2ObjectMapperBuilder successor that can live in spring-core instead of spring-web since that's a popular asks by portfolio projects that do not depends on spring-web but need to serialize/deserialize JSON. Notice that modern Jackson versions already provide a builder via JsonMapper.Builder. - See if for JSON we use JsonMapper instead of ObjectMapper