feat(cart): Migration file (#6156)

* feat(cart): Migration file

* fixup migration

* Add indexes on cart table for currency, region, and sales channel

* fix indexes

* address PR comments

packages/cart/integration-tests/__tests__/services/cart-module/index.spec.ts

@@ -1,9 +1,9 @@
+import { Modules } from "@medusajs/modules-sdk"
 import { ICartModuleService } from "@medusajs/types"
 import { CheckConstraintViolationException } from "@mikro-orm/core"
-import { MikroOrmWrapper } from "../../../utils"
-import { Modules } from "@medusajs/modules-sdk"
-import { getInitModuleConfig } from "../../../utils/get-init-module-config"
 import { initModules } from "medusa-test-utils"
+import { MikroOrmWrapper } from "../../../utils"
+import { getInitModuleConfig } from "../../../utils/get-init-module-config"
 
 jest.setTimeout(30000)