Feat(order): order changes (#6614)

This is a PR to keep them relatively small. Very likely changes, validations and other features will be added.

What:
  Basic methods to cancel, confirm or decline order changes
  Apply order changes to modify and create a new version of an order

Things related to calculation, Order and Item totals are not covered in this PR. Properties won't match with definition, etc.

Co-authored-by: Adrien de Peretti <25098370+adrien2p@users.noreply.github.com>

packages/order/src/utils/action-key.ts

@@ -8,5 +8,6 @@ export enum ChangeActionType {
   RECEIVE_RETURN_ITEM = "RECEIVE_RETURN_ITEM",
   RETURN_ITEM = "RETURN_ITEM",
   SHIPPING_ADD = "SHIPPING_ADD",
+  SHIP_ITEM = "SHIP_ITEM",
   WRITE_OFF_ITEM = "WRITE_OFF_ITEM",
 }