Resolve #3490355 "Sibling file approach"

Closes #3490355

core/lib/Drupal/Core/Hook/Attribute/StopProceduralHookScan.php

+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Core\Hook\Attribute;
+
+/**
+ * Defines a StopProceduralHookScan attribute object.
+ *
+ * This allows contrib and core to mark when a file has no more
+ * procedural hooks.
+ */
+#[\Attribute(\Attribute::TARGET_FUNCTION)]
+class StopProceduralHookScan {
+
+}