chore: prefer named exports (#8315)

* chore: prefer named exports

* chore: fix import

src/tag/Tag.tsx

@@ -1,6 +1,6 @@
 import { CSSProperties, PropType, Transition, defineComponent } from 'vue';
 import { createNamespace } from '../utils';
-import Icon from '../icon';
+import { Icon } from '../icon';
 
 const [name, bem] = createNamespace('tag');
 

src/tag/test/index.spec.ts

@@ -1,4 +1,4 @@
-import Tag from '..';
+import { Tag } from '..';
 import { mount } from '../../../test';
 
 test('should emit close event when clicking the close icon', () => {