perf(component): 1.优化appendSchemaByField只能单一添加一个表单项的问题，可以传入数组表单项，统一添加，减少重复方法调用 2. 增加批量添加表单项demo (#2472)

src/views/demo/form/AppendForm.vue

@@ -4,6 +4,7 @@
       <BasicForm @register="register" @submit="handleSubmit">
         <template #add="{ field }">
           <Button v-if="Number(field) === 0" @click="add">+</Button>
+          <Button class="ml-2" v-if="Number(field) === 0" @click="add">批量添加表单配置</Button>
           <Button v-if="field > 0" @click="del(field)">-</Button>
         </template>
       </BasicForm>
@@ -106,13 +107,51 @@
         );
         n.value++;
       }
+      /**
+       * @description: 批量添加
+       */
+      function batchAdd() {
+        appendSchemaByField(
+          [
+            {
+              field: `field${n.value}a`,
+              component: 'Input',
+              label: '字段' + n.value,
+              colProps: {
+                span: 8,
+              },
+              required: true,
+            },
+            {
+              field: `field${n.value}b`,
+              component: 'Input',
+              label: '字段' + n.value,
+              colProps: {
+                span: 8,
+              },
+              required: true,
+            },
+            {
+              field: `${n.value}`,
+              component: 'Input',
+              label: ' ',
+              colProps: {
+                span: 8,
+              },
+              slot: 'add',
+            },
+          ],
+          '',
+        );
+        n.value++;
+      }
 
       function del(field) {
         removeSchemaByField([`field${field}a`, `field${field}b`, `${field}`]);
         n.value--;
       }
 
-      return { register, handleSubmit, add, del };
+      return { register, handleSubmit, add, del, batchAdd };
     },
   });
 </script>