feat: add getter for response key

Author: Mike Harrison

src/Debugger.php

@@ -177,6 +177,16 @@ protected function setResponseData(Response $response, $data)
         return $response->setContent($content);
     }
 
+    /**
+     * Get the current response key
+     *
+     * @return string
+     */
+    public function getResponseKey()
+    {
+        return $this->responseKey;
+    }
+
     /**
      * Set response attribute key name.
      *