UI for adding/editing field unions and associated field concerns (widget/formatter)

Add test form for field union view display.

config/schema/field_union.schema.yml

@@ -23,26 +23,26 @@ field_union.field_union.*:
             label: 'Field type'
           label:
             type: label
-            name: 'label'
+            label: 'label'
           name:
             type: string
-            name: 'Machine name'
+            label: 'Machine name'
           description:
             type: label
-            name: 'Description'
+            label: 'Description'
           required:
             type: boolean
-            name: 'Required'
+            label: 'Required'
           translatable:
             type: boolean
-            name: 'Translatable'
+            label: 'Translatable'
           default_value:
             type: sequence
             label: 'Default values'
             sequence:
               type: field.value.[%parent.%parent.field_type]
               label: 'Default value'
-          settings:
+          storage_settings:
             type: field.storage_settings.[%parent.field_type]
-          instance_settings:
+          settings:
             type: field.field_settings.[%parent.field_type]