Add resource for Discount Type

[nicosomb]

Questions	Answers
Description?	Add resource for Discount Type, see PrestaShop/PrestaShop#40536
Type?	new feature
BC breaks?	no
Deprecations?	no
Fixed ticket?	N/A
Sponsor company	PrestaShop SA
How to test?	GET http://myshop/admin-api/discount-types should return a json with discount types (see below)

Example of json response

[
	{
		"discountTypeId": 1,
		"type": "free_shipping",
		"names": {
			"en-US": "On free shipping",
			"fr-FR": "On free shipping"
		},
		"descriptions": {
			"en-US": "Discount that provides free shipping to the order",
			"fr-FR": "Discount that provides free shipping to the order"
		},
		"active": true
	},
	{
		"discountTypeId": 2,
		"type": "cart_level",
		"names": {
			"en-US": "On cart amount",
			"fr-FR": "On cart amount"
		},
		"descriptions": {
			"en-US": "Discount applied to cart",
			"fr-FR": "Discount applied to cart"
		},
		"active": true
	},
	{
		"discountTypeId": 3,
		"type": "order_level",
		"names": {
			"en-US": "On total order",
			"fr-FR": "On total order"
		},
		"descriptions": {
			"en-US": "Discount applied to the order",
			"fr-FR": "Discount applied to the order"
		},
		"active": true
	},
	{
		"discountTypeId": 4,
		"type": "product_level",
		"names": {
			"en-US": "On catalog products",
			"fr-FR": "On catalog products"
		},
		"descriptions": {
			"en-US": "Discount applied to specific products",
			"fr-FR": "Discount applied to specific products"
		},
		"active": true
	},
	{
		"discountTypeId": 5,
		"type": "free_gift",
		"names": {
			"en-US": "On free gift",
			"fr-FR": "On free gift"
		},
		"descriptions": {
			"en-US": "Discount that provides a free gift product",
			"fr-FR": "Discount that provides a free gift product"
		},
		"active": true
	}
]

[jolelievre]

Some minor things to fix, and the test class in the core's PR should be moved in this module and we're good

[jolelievre]

Ah, and for your next PRs prefer using your fork please

[nicosomb]

Ah, and for your next PRs prefer using your fork please

oops, sorry

[jolelievre]

You need to use explicit asertEquals with complete data (to make sure all fields are present, and no field in missing in the expected data Not necessarily all the types but at least the first one