feat: key value widget (#865)

packages/core/test/data/fields.mock.ts

@@ -3,6 +3,7 @@ import type {
   ColorField,
   DateTimeField,
   FileOrImageField,
+  KeyValueField,
   MarkdownField,
   NumberField,
   RelationField,
@@ -55,6 +56,12 @@ export const mockImageField: FileOrImageField = {
   widget: 'image',
 };
 
+export const mockKeyValueField: KeyValueField = {
+  label: 'Key Value',
+  name: 'mock_key_value',
+  widget: 'keyvalue',
+};
+
 export const mockMarkdownField: MarkdownField = {
   label: 'Body',
   name: 'body',