refactor: reorganize all components (#8303)

src/col/Col.tsx

@@ -1,11 +1,13 @@
-import { computed, PropType } from 'vue';
+import { computed, PropType, defineComponent } from 'vue';
 import { createNamespace } from '../utils';
 import { useParent } from '@vant/use';
-import { ROW_KEY, RowProvide } from '../row';
+import { ROW_KEY, RowProvide } from '../row/Row';
 
-const [createComponent, bem] = createNamespace('col');
+const [name, bem] = createNamespace('col');
+
+export default defineComponent({
+  name,
 
-export default createComponent({
   props: {
     offset: [Number, String],
     tag: {

src/col/index.ts

@@ -0,0 +1,7 @@
+import { installable } from '../utils';
+import _Col from './Col';
+
+const Col = installable(_Col);
+
+export default Col;
+export { Col };