serialize max length attribute for wizard fields

serializers/custom_wizard/wizard_field_serializer.rb

@@ -8,6 +8,7 @@ class CustomWizard::FieldSerializer < ::WizardFieldSerializer
              :limit,
              :property,
              :content,
+             :max_length,
              :char_counter
                
   def label
@@ -56,6 +57,10 @@ class CustomWizard::FieldSerializer < ::WizardFieldSerializer
     object.choices.present?
   end
 
+  def max_length
+    object.max_length
+  end
+
   def char_counter
     object.char_counter
   end