feat(shipments): add ShipmentProviderInterface and ShipmentProviderRegistry

- Introduced ShipmentProviderInterface to define the contract for shipment providers.
- Implemented ShipmentProviderRegistry to manage and retrieve shipment providers.
- Added a new tool for probing Apaczka order_send payload variants, enhancing debugging capabilities.

src/Modules/Shipments/ShipmentProviderInterface.php

@@ -0,0 +1,30 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Modules\Shipments;
+
+interface ShipmentProviderInterface
+{
+    public function code(): string;
+
+    /**
+     * @return array<int, array<string, mixed>>
+     */
+    public function getDeliveryServices(): array;
+
+    /**
+     * @param array<string, mixed> $formData
+     * @return array<string, mixed>
+     */
+    public function createShipment(int $orderId, array $formData): array;
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function checkCreationStatus(int $packageId): array;
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function downloadLabel(int $packageId, string $storagePath): array;
+}