feat(Stepper): new component (#2733)

Co-authored-by: Benjamin Canac <canacb1@gmail.com>

docs/app/components/content/examples/stepper/StepperContentSlotExample.vue

@@ -0,0 +1,26 @@
+<script setup lang="ts">
+const items = [
+  {
+    title: 'Address',
+    description: 'Add your address here',
+    icon: 'i-lucide-house'
+  }, {
+    title: 'Shipping',
+    description: 'Set your preferred shipping method',
+    icon: 'i-lucide-truck'
+  }, {
+    title: 'Checkout',
+    description: 'Confirm your order'
+  }
+]
+</script>
+
+<template>
+  <UStepper ref="stepper" :items="items" class="w-full">
+    <template #content="{ item }">
+      <Placeholder class="aspect-video">
+        This is the {{ item?.title }} step.
+      </Placeholder>
+    </template>
+  </UStepper>
+</template>