add 新增全局ele类型声明

.eslintrc-auto-import.json

@@ -2,6 +2,7 @@
   "globals": {
     "ComponentInternalInstance": true,
     "ElFormRules": true,
+    "CheckboxValueType": true,
     "PropType": true,
     "DateModelType": true,
     "UploadFile": true,

src/types/element.d.ts

@@ -26,6 +26,7 @@ declare global {
   declare type ElSliderInstance = InstanceType<typeof ep.ElSlider>;
   declare type ElUploadInstance = InstanceType<typeof ep.ElUpload>;
 
+  declare type CheckboxValueType = ep.CheckboxValueType;
   declare type ElFormRules = ep.FormRules;
   declare type DateModelType = ep.DateModelType;
   declare type UploadFile = typeof ep.UploadFile;