Add new classes and methods for session management

src/Socialbox/Classes/StandardMethods/Ping.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Socialbox\Classes\StandardMethods;
+
+use Socialbox\Abstracts\Method;
+use Socialbox\Interfaces\SerializableInterface;
+use Socialbox\Objects\ClientRequest;
+use Socialbox\Objects\RpcRequest;
+
+class Ping extends Method
+{
+    /**
+     * @inheritDoc
+     */
+    public static function execute(ClientRequest $request, RpcRequest $rpcRequest): ?SerializableInterface
+    {
+        return $rpcRequest->produceResponse(true);
+    }
+}