simple allOf case

[trajano]

This is to extend the proposal for allOf but for the simple case

For each allOf

• if type is not the same across then it should translate to

import jakarta.validation.constraints.Null;
...
@Null
Object propertyThatShouldBeNull;

Or throw an IllogicalSchemaException

• If all types are objects
  • additionalProperties = all entries have additionalProperties == true
  • required = union of all required lists in each entry
  • properties = union of all properties in each entry (there should be something further to handle duplicates, but we can put a warning for that situation for now)

I am just after the "generation" of the POJO but it does not need to be "precise" because the validation can be done based on the real schema on a different part of the code, I think the objective is to at least provide the getters and setters that would be used at minimum