Add simple Action Scheduler wrapper service

[MAILPOET-4136]

mailpoet/lib/Automation/Engine/Control/ActionScheduler.php

@@ -0,0 +1,15 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\Automation\Engine\Control;
+
+class ActionScheduler {
+  private const GROUP_ID = 'mailpoet-automation';
+
+  public function enqueue(string $hook, array $args = []): int {
+    return as_enqueue_async_action($hook, $args, self::GROUP_ID);
+  }
+
+  public function schedule(int $timestamp, string $hook, array $args = []): int {
+    return as_schedule_single_action($timestamp, $hook, $args, self::GROUP_ID);
+  }
+}