feat: line item adjustments (#1319)

* add: crud services + model + totals

* fix: enforce unique constraint on line item adjustment model and update service (#1241)

* add: unique constraint on model + fix service

* fix: unique constraint

* fix: add cascade on delete + fix discount relation

* fix: remove optional unique prop

* add: tests for ensuring line item adjustment db constraints (#1279)

* add: tests for ensuring db constraints

* fix: use given when then

* feat: adjust cart to include line item adjustments (#1242)

* fix: cart service + cart tests

* fix: remaining tests

* fix: swap tests

* fix: add relationship + fix oas

* refactor: applyDiscount

* fix: refactor applyDiscount and fix + add unit tests

* fix: plugins tests

* feat: line item adjustments draft orders (#1243)

* fix: draft order tests

* fix: constraint

* fix: wrong variable name

* fix: unique constraint

* progress: add tests

* fix: add cascade on delete + fix discount relation

* fix: remove optional unique prop

* fix: cart removeLineItem + tests

* fix: cart unit tests

* fix: update snapshot

* remove: verbose option

* rename arg

Co-authored-by: Sebastian Rindom <skrindom@gmail.com>

* add: create adjustments for swap additional_items

* add: create adjustments for return lines

* fix: unit test for creating adjustment for additional_items

* fix: create adjustments only for non return items + no deletion when item is a return item

* add: integration tests

* refactor: use refreshAdjustments method

* refactor test

Co-authored-by: Sebastian Rindom <skrindom@gmail.com>

Co-authored-by: Sebastian Rindom <skrindom@gmail.com>

Co-authored-by: Sebastian Rindom <skrindom@gmail.com>

integration-tests/api/helpers/order-seeder.js

@@ -173,6 +173,14 @@ module.exports = async (connection, data = {}) => {
     quantity: 1,
     variant_id: "test-variant",
     order_id: "test-order",
+    adjustments: [
+      {
+        amount: 800,
+        discount_id: "test-discount",
+        description: "discount",
+        item_id: "test-item",
+      },
+    ],
   })
 
   await manager.save(li)