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/views/templates/admin/config/gui/preview_btn.html.twig

@@ -0,0 +1,6 @@
+<inpost-izi-button
+  {% for attr, value in btnConfig %}
+    {{ attr }}="{{ value }}"
+  {% endfor %}
+>
+</inpost-izi-button>