Add RequestContext and logging (#176)

* Implemented MCP logging specification with auto-injection

* Add RequestContext

* fix tests and style

* Better deprecation

* fix: minor

* Remove ClientAwareInterface

* fix cs

* fix docs

---------

Co-authored-by: Adam Jamiu <jamiuadam120@gmail.com>

src/Server/Handler/Request/SetLogLevelHandler.php

@@ -0,0 +1,49 @@
+<?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\Handler\Request;
+
+use Mcp\Schema\JsonRpc\Request;
+use Mcp\Schema\JsonRpc\Response;
+use Mcp\Schema\Request\SetLogLevelRequest;
+use Mcp\Schema\Result\EmptyResult;
+use Mcp\Server\Protocol;
+use Mcp\Server\Session\SessionInterface;
+
+/**
+ * Handler for the logging/setLevel request.
+ *
+ * Handles client requests to set the logging level for the server.
+ * The server should send all logs at this level and higher (more severe) to the client.
+ *
+ * @implements RequestHandlerInterface<EmptyResult>
+ *
+ * @author Adam Jamiu <jamiuadam120@gmail.com>
+ */
+final class SetLogLevelHandler implements RequestHandlerInterface
+{
+    public function supports(Request $request): bool
+    {
+        return $request instanceof SetLogLevelRequest;
+    }
+
+    /**
+     * @return Response<EmptyResult>
+     */
+    public function handle(Request $request, SessionInterface $session): Response
+    {
+        \assert($request instanceof SetLogLevelRequest);
+
+        $session->set(Protocol::SESSION_LOGGING_LEVEL, $request->level->value);
+
+        return new Response($request->getId(), new EmptyResult());
+    }
+}