feat: implement queue system with consumer and message handling (#14)

Reviewed-on: #14
Co-authored-by: Ron Rise <ron@siteworxpro.com>
Co-committed-by: Ron Rise <ron@siteworxpro.com>

src/Async/Handlers/HandlerInterface.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Siteworxpro\App\Async\Handlers;
+
+use Siteworxpro\App\Async\Messages\Message;
+
+interface HandlerInterface
+{
+    public function __invoke(Message $message): void;
+}