feat(cart): Cart + Address services (#6055)

Duplicate of #6008, but I messed up my git history big time :'(

**What**
- CartService and CartRepository + tests
- AddressService and AddressRepository + tests
- CartModuleService skeleton. Full implementation + tests will be added in a separate PR

packages/cart/src/repositories/address.ts

@@ -0,0 +1,27 @@
+import { Context } from "@medusajs/types"
+import { DALUtils } from "@medusajs/utils"
+import { SqlEntityManager } from "@mikro-orm/postgresql"
+import { Address } from "@models"
+import { CreateAddressDTO, UpdateAddressDTO } from "../types"
+
+export class AddressRepository extends DALUtils.mikroOrmBaseRepositoryFactory<
+  Address,
+  {
+    create: CreateAddressDTO
+  }
+>(Address) {
+  async update(
+    data: { address: Address; update: UpdateAddressDTO }[],
+    context: Context = {}
+  ): Promise<Address[]> {
+    const manager = this.getActiveManager<SqlEntityManager>(context)
+
+    const entities = data.map(({ address, update }) => {
+      return manager.assign(address, update)
+    })
+
+    manager.persist(entities)
+
+    return entities
+  }
+}