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/vendor/maennchen/zipstream-php/CONTRIBUTING.md

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+# ZipStream Readme for Contributors
+## Code styling
+### Indention
+For spaces are used to indent code. The convention is [K&R](http://en.wikipedia.org/wiki/Indent_style#K&R)
+
+### Comments
+Double Slashes are used for an one line comment.
+
+Classes, Variables, Methods etc:
+
+```php
+/**
+ * My comment
+ *
+ * @myanotation like @param etc.
+ */
+```
+
+## Pull requests
+Feel free to submit pull requests.
+
+## Testing
+For every new feature please write a new PHPUnit test.
+
+Before every commit execute `./vendor/bin/phpunit` to check if your changes wrecked something: