Add unit tests and abstract bot method execution framework

src/TgBotLib/Enums/Methods.php

@@ -0,0 +1,19 @@
+<?php
+
+    namespace TgBotLib\Enums;
+
+    use TgBotLib\Bot;
+    use TgBotLib\Methods\GetMe;
+
+    enum Methods : string
+    {
+        case GET_ME = 'getMe';
+
+        public function execute(Bot $bot, array $parameters=[]): mixed
+        {
+            return match($this)
+            {
+                self::GET_ME => GetMe::execute($bot, $parameters),
+            };
+        }
+    }