fix: 暴露方法

package.json

 {
     "name": "panda-xform",
-    "version": "2.9.6",
-    "description": "2.9.6: 修改地图传参",
+    "version": "3.0.0",
+    "description": "3.0.0: 暴露方法",
     "keywords": [
         "panda-xform"
     ],

src/core/FormDesigner/index.js

@@ -17,6 +17,7 @@ const FormDesigner = (props, ref) => {
       clear,
       preview,
       submit,
+      initLayout,
     }
   ))