remove redundant methods in Transport (#163)

src/Server/Transport/InMemoryTransport.php

@@ -21,8 +21,6 @@ use Symfony\Component\Uid\Uuid;
  */
 class InMemoryTransport extends BaseTransport implements TransportInterface
 {
-    use ManagesTransportCallbacks;
-
     /**
      * @param list<string> $messages
      */
@@ -33,10 +31,6 @@ class InMemoryTransport extends BaseTransport implements TransportInterface
         parent::__construct($logger);
     }
 
-    public function initialize(): void
-    {
-    }
-
     public function onMessage(callable $listener): void
     {
         $this->messageListener = $listener;

src/Server/Transport/StreamableHttpTransport.php

@@ -60,10 +60,6 @@ class StreamableHttpTransport extends BaseTransport implements TransportInterfac
         ], $corsHeaders);
     }
 
-    public function initialize(): void
-    {
-    }
-
     public function send(string $data, array $context): void
     {
         $this->immediateResponse = $data;