feat(FormGroup): add eager validation (#992)

docs/components/content/examples/FormGroupEagerValidationExample.vue

@@ -0,0 +1,19 @@
+<template>
+  <UForm :schema="schema" :state="state" class="space-y-4">
+    <UFormGroup label="Username" name="username" eager-validation>
+      <UInput v-model="state.username" placeholder="Choose Username" />
+    </UFormGroup>
+  </UForm>
+</template>
+
+<script setup>
+import { z } from 'zod'
+
+const schema = z.object({
+  username: z.string().min(10, 'Must be at least 10 characters')
+})
+
+const state = reactive({
+  username: undefined
+})
+</script>