feat(Form): add superstruct validation (#2363)

Co-authored-by: Benjamin Canac <canacb1@gmail.com>
Co-authored-by: Romain Hamel <rom.hml@gmail.com>

docs/app/components/content/examples/form/FormExampleSuperstruct.vue

@@ -0,0 +1,39 @@
+<script setup lang="ts">
+import { object, string, nonempty, refine, type Infer } from 'superstruct'
+import type { FormSubmitEvent } from '#ui/types'
+
+const schema = object({
+  email: nonempty(string()),
+  password: refine(string(), 'Password', (value) => {
+    if (value.length >= 8) return true
+    return 'Must be at least 8 characters'
+  })
+})
+
+const state = reactive({
+  email: '',
+  password: ''
+})
+
+type Schema = Infer<typeof schema>
+
+async function onSubmit(event: FormSubmitEvent<Schema>) {
+  console.log(event.data)
+}
+</script>
+
+<template>
+  <UForm :schema="schema" :state="state" class="space-y-4" @submit="onSubmit">
+    <UFormField label="Email" name="email">
+      <UInput v-model="state.email" />
+    </UFormField>
+
+    <UFormField label="Password" name="password">
+      <UInput v-model="state.password" type="password" />
+    </UFormField>
+
+    <UButton type="submit">
+      Submit
+    </UButton>
+  </UForm>
+</template>