refactor: reorganize all components (#8303)

src/step/Step.tsx

@@ -1,9 +1,9 @@
-import { computed } from 'vue';
+import { computed, defineComponent } from 'vue';
 
 // Utils
 import { createNamespace } from '../utils';
 import { BORDER } from '../utils/constant';
-import { STEPS_KEY, StepsProvide } from '../steps';
+import { STEPS_KEY, StepsProvide } from '../steps/Steps';
 
 // Composables
 import { useParent } from '@vant/use';
@@ -11,9 +11,11 @@ import { useParent } from '@vant/use';
 // Components
 import Icon from '../icon';
 
-const [createComponent, bem] = createNamespace('step');
+const [name, bem] = createNamespace('step');
+
+export default defineComponent({
+  name,
 
-export default createComponent({
   setup(props, { slots }) {
     const { parent, index } = useParent<StepsProvide>(STEPS_KEY);
 

src/step/index.ts

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