Feat/field hide if function

[pbaumes]

This version adds support for the ‘hideIf()’ function for form fields.

e.g.

yield TextField::new('property')
  ->hideIf(function($entity) {
     return !$entity->hasRequiredProperty();
  });
;

or

yield TextField::new('property')
  ->hideIf(!$entity->isPublished());
;

Fixes: https://github.com/EasyCorp/EasyAdminBundle/issues/6922