Adopt Schema component in server handlers

src/Schema/JsonRpc/HasMethodInterface.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * 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\Schema\JsonRpc;
+
+/**
+ * Interface for all incoming JSON-RPC messages that should be processed by a handler, and are expected to have a method.
+ *
+ * @author Christopher Hertel <mail@christopher-hertel.de>
+ */
+interface HasMethodInterface
+{
+    public static function getMethod(): string;
+
+    /**
+     * @param array<string, mixed> $data
+     */
+    public static function fromArray(array $data): self;
+}