feat(Tabs): handle icon in items (#1798)

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

docs/components/content/examples/TabsExampleIconSlot.vue

@@ -0,0 +1,23 @@
+<script setup lang="ts">
+const items = [{
+  label: 'Getting Started',
+  icon: 'i-heroicons-information-circle',
+  content: 'This is the content shown for Tab1'
+}, {
+  label: 'Installation',
+  icon: 'i-heroicons-arrow-down-tray',
+  content: 'And, this is the content for Tab2'
+}, {
+  label: 'Theming',
+  icon: 'i-heroicons-eye-dropper',
+  content: 'Finally, this is the content for Tab3'
+}]
+</script>
+
+<template>
+  <UTabs :items="items" class="w-full">
+    <template #icon="{ item, selected }">
+      <UIcon :name="item.icon" class="w-4 h-4 flex-shrink-0 mr-2" :class="[selected && 'text-primary-500 dark:text-primary-400']" />
+    </template>
+  </UTabs>
+</template>