chore(order): preview order change (#8025)

What:
 - new method `previewOrderChange`
   - Calculate all the actions related to an order change.
   - Return the preview of the final Order, with all the calculated values.
   - Associate actions with items and shipping_methods they modified.

FIXES: CORE-2509

packages/modules/order/src/utils/set-action-reference.ts

@@ -1,6 +1,19 @@
-export function setActionReference(existing, action) {
+export function setActionReference(existing, action, options) {
+  existing.detail ??= {}
+
   existing.detail.order_id ??= action.order_id
   existing.detail.return_id ??= action.return_id
   existing.detail.claim_id ??= action.claim_id
   existing.detail.exchange_id ??= action.exchange_id
+
+  if (options?.addActionReferenceToObject) {
+    existing.actions ??= []
+    existing.actions.push(action)
+  }
+}
+
+export function unsetActionReference(existing, action) {
+  if (Array.isArray(existing?.actions)) {
+    existing.actions = existing.actions.filter((a) => a.id !== action.id)
+  }
 }