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>

tests/Unit/Server/Handler/Request/SetLogLevelHandlerTest.php

@@ -0,0 +1,74 @@
+<?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\Tests\Unit\Server\Handler\Request;
+
+use Mcp\Schema\Enum\LoggingLevel;
+use Mcp\Schema\JsonRpc\Request;
+use Mcp\Schema\Request\SetLogLevelRequest;
+use Mcp\Schema\Result\EmptyResult;
+use Mcp\Server\Handler\Request\SetLogLevelHandler;
+use Mcp\Server\Protocol;
+use Mcp\Server\Session\Session;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @author Adam Jamiu <jamiuadam120@gmail.com>
+ */
+class SetLogLevelHandlerTest extends TestCase
+{
+    public function testSupports(): void
+    {
+        $request = $this->createSetLogLevelRequest(LoggingLevel::Info);
+        $handler = new SetLogLevelHandler();
+        $this->assertTrue($handler->supports($request));
+    }
+
+    public function testDoesNotSupportOtherRequests(): void
+    {
+        $otherRequest = $this->createMock(Request::class);
+        $handler = new SetLogLevelHandler();
+        $this->assertFalse($handler->supports($otherRequest));
+    }
+
+    public function testHandleAllLogLevelsAndSupport(): void
+    {
+        $handler = new SetLogLevelHandler();
+
+        foreach (LoggingLevel::cases() as $level) {
+            $request = $this->createSetLogLevelRequest($level);
+
+            $session = $this->getMockBuilder(Session::class)
+                ->disableOriginalConstructor()
+                ->onlyMethods(['set'])
+                ->getMock();
+            $session->expects($this->once())
+                ->method('set')
+                ->with(Protocol::SESSION_LOGGING_LEVEL, $level->value);
+
+            $response = $handler->handle($request, $session);
+            $this->assertEquals($request->getId(), $response->id);
+            $this->assertInstanceOf(EmptyResult::class, $response->result);
+        }
+    }
+
+    private function createSetLogLevelRequest(LoggingLevel $level): SetLogLevelRequest
+    {
+        return SetLogLevelRequest::fromArray([
+            'jsonrpc' => '2.0',
+            'method' => SetLogLevelRequest::getMethod(),
+            'id' => 'test-request-'.uniqid(),
+            'params' => [
+                'level' => $level->value,
+            ],
+        ]);
+    }
+}