add ability to get an action description from anywhere

src/AbstractCleaner.php

@@ -53,6 +53,16 @@ abstract class AbstractCleaner
         $this->actions = $actions;
     }
 
+    /**
+     * Get an action description.
+     *
+     * @return  null|ActionDescriptor   The action descriptor
+     */
+    final public function get(string $id): ?ActionDescriptor
+    {
+        return $this->actions[$id] ?? null;
+    }
+
     /**
      * Initialize Cleaner properties.
      *