Adopt Schema component in server handlers

src/Server/Transport/InMemoryTransport.php

@@ -0,0 +1,53 @@
+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mcp\Server\Transport;
+
+use Mcp\Server\TransportInterface;
+
+/**
+ * @author Tobias Nyholm <tobias.nyholm@gmail.com>
+ */
+class InMemoryTransport implements TransportInterface
+{
+    private bool $connected = true;
+
+    /**
+     * @param list<string> $messages
+     */
+    public function __construct(
+        private readonly array $messages = [],
+    ) {
+    }
+
+    public function initialize(): void
+    {
+    }
+
+    public function isConnected(): bool
+    {
+        return $this->connected;
+    }
+
+    public function receive(): \Generator
+    {
+        yield from $this->messages;
+        $this->connected = false;
+    }
+
+    public function send(string $data): void
+    {
+    }
+
+    public function close(): void
+    {
+    }
+}