Feat(inventory-next, medusa): Add List inventory items endpoint (#6694)

* code for list inventory items

* fix integration tests

* move integration test

* calculate reserved and stocked quantities in db

* update lockfile

packages/types/src/inventory/common/inventory-level.ts

@@ -46,6 +46,7 @@ export interface InventoryLevelDTO {
   stocked_quantity: number
   reserved_quantity: number
   incoming_quantity: number
+  available_quantity: number
   metadata: Record<string, unknown> | null
   created_at: string | Date
   updated_at: string | Date