feat: Introduce event listener registration contract

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

shared/lib/Event/EventListenerRegistrarInterface.php

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace KTXF\Event;
+
+interface EventListenerRegistrarInterface
+{
+    /**
+     * @param class-string $service
+     */
+    public function listen(
+        string $module,
+        string $event,
+        string $service,
+        string $method,
+        DeliveryMode $delivery = DeliveryMode::Immediate,
+        int $priority = 0,
+        FailurePolicy $failurePolicy = FailurePolicy::Continue,
+    ): void;
+}

shared/lib/Event/EventListenerRegistry.php

@@ -6,7 +6,7 @@ namespace KTXF\Event;
 
 use Psr\Container\ContainerInterface;
 
-final class EventListenerRegistry
+final class EventListenerRegistry implements EventListenerRegistrarInterface
 {
     /** @var array<string, list<EventListenerDefinition>> */
     private array $listeners = [];