reword touched logic and export it as a store

packages/builder/src/helpers/validation/validation.js

@@ -4,15 +4,16 @@ export function createValidationStore(initialValue, ...validators) {
 	let touched = false
 	
 	const value = writable(initialValue || '') 
-	const error = derived(value, $v => {
-		if (touched) {
-			return validate($v, validators)
-		} else {
+	const error = derived(value, $v => validate($v, validators))
+	const touchedStore = derived(value, () => {
+		if (!touched) {
 			touched = true
+			return
 		} 
+		return touched
 	})
 	
-	return [value, error]
+	return [value, error, touchedStore]
 }
 
 function validate(value, validators) {