Add InPost Pay integration to admin templates

- Created a new template for the cart rule form with custom label, switch, and choice widgets.
- Implemented the InPost Pay block in the order details template for displaying delivery method, APM, and VAT invoice request.
- Added legacy support for the order details template to maintain compatibility with older PrestaShop versions.

modules/inpostizi/src/BasketApp/Payment/PaymentsApiClientInterface.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace izi\prestashop\BasketApp\Payment;
+
+use izi\prestashop\BasketApp\Payment\Response\AvailablePaymentOptions;
+
+interface PaymentsApiClientInterface
+{
+    public function getAvailablePaymentOptions(): AvailablePaymentOptions;
+}

modules/inpostizi/src/BasketApp/Payment/Response/AvailablePaymentOptions.php

@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace izi\prestashop\BasketApp\Payment\Response;
+
+use izi\prestashop\Common\PaymentType;
+
+/**
+ * @implements \IteratorAggregate<PaymentType>
+ */
+final class AvailablePaymentOptions implements \JsonSerializable, \IteratorAggregate
+{
+    /**
+     * @var PaymentType[]
+     */
+    private $payment_type;
+
+    /**
+     * @param PaymentType[] $payment_type
+     */
+    public function __construct(array $payment_type)
+    {
+        $this->payment_type = $payment_type;
+    }
+
+    /**
+     * @return PaymentType[]
+     */
+    public function getPaymentTypes(): array
+    {
+        return $this->payment_type;
+    }
+
+    public function jsonSerialize(): array
+    {
+        return get_object_vars($this);
+    }
+
+    public function getIterator(): \Iterator
+    {
+        return new \ArrayIterator($this->payment_type);
+    }
+}