feat(table): add slot for empty state (#260)

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

docs/content/4.data/1.table.md

@@ -482,6 +482,39 @@ const selected = ref([people[1]])
 ```
 ::
 
+### `empty-state`
+
+Use the `#empty-state` slot to customize the empty state.
+
+::component-example{class="grid"}
+---
+padding: false
+overflowClass: 'overflow-x-auto'
+---
+
+#default
+:table-example-empty-slot{class="flex-1"}
+
+#code
+```vue
+<script setup>
+const columns = [...]
+const people = [...]
+</script>
+
+<template>
+  <UTable :rows="people" :columns="columns">
+    <template #empty-state>
+      <div class="flex flex-col items-center justify-center py-6 gap-3">
+        <span class="italic text-sm">No one here!</span>
+        <UButton label="Add people" />
+      </div>
+    </template>
+  </UTable>
+</template>
+```
+::
+
 ## Props
 
 :component-props