feat: CartRegion link, definition + workflow (#6392)

packages/types/src/cart/index.ts

@@ -1,4 +1,4 @@
 export * from "./common"
 export * from "./mutations"
 export * from "./service"
-
+export * from "./workflows"

packages/types/src/cart/workflows.ts

@@ -0,0 +1,20 @@
+import {
+  CreateAddressDTO,
+  CreateLineItemDTO,
+  UpdateAddressDTO,
+} from "./mutations"
+
+export interface CreateCartWorkflowInputDTO {
+  region_id?: string
+  customer_id?: string
+  sales_channel_id?: string
+  email?: string
+  currency_code: string
+  shipping_address_id?: string
+  billing_address_id?: string
+  shipping_address?: CreateAddressDTO | UpdateAddressDTO
+  billing_address?: CreateAddressDTO | UpdateAddressDTO
+  metadata?: Record<string, unknown>
+
+  items?: CreateLineItemDTO[]
+}