make CodegenWithAttribtues take a Traversable<T> instead of vec<T>

Author: fredemmott

src/CodegenWithAttributes.php

@@ -21,7 +21,7 @@ final public function addEmptyUserAttribute(string $name): this {
 
   final public function addUserAttribute<T>(
     string $name,
-    vec<T> $values,
+    Traversable<T> $values,
     IHackBuilderValueRenderer<T> $renderer,
   ): this {
     $this->userAttributes[$name] =