Use BeanIntrospection to check if null should be suppress

[sdelamo]

Close: #2933

The tests at BeanIntrospectionModuleSpec already passed without the shouldSuppressNulls fix.

We will need to add a functional test to the Graal tests @ilopmar setup.

Moreover, should I move BeanIntrospectionUtils to a different place?

[graemerocher]

I cleaned up the PR since it over complicated matters a bit

[sdelamo]

Thanks, I did not know about:

  JsonInclude.Include include = beanProperty.enumValue(JsonInclude.class, JsonInclude.Include.class).orElse(null);
             if (include == null) {
                 include = beanProperty.getDeclaringBean().enumValue(JsonInclude.class, JsonInclude.Include.class).orElse(null);
             }

That simplifies things.

[ilopmar]

I'll work on the test application and add it to our pipeline