feat(medusa): Performance improvements of Carts domain (#2648)

**What**

I have created a new method on the cart service which is `addLineItems`, allowing a user to add one or multiple items in an optimized way. Also updated the `generate` method from the line item service which now also accept a object data or a collection of data which. Various places have been optimized and cache support has been added to the price selection strategy.

The overall optimization allows to reach another 9000% improvement in the response time as a median (Creating a cart with 6 items):

|   | Min (ms)  | Median (ms)  | Max (ms)  | Median Improvement (%)
|---|:-:|---|---|---|
| Before optimisation  | 1200  | 9999 | 12698  |  N/A
| After optimisation | 63  | 252  | 500  | 39x
| After re optimisation | 56 | 82  | 399  | 121x
| After including addressed feedback | 65 | 202  | 495  | 49x

FIXES CORE-722

integration-tests/api/__tests__/batch-jobs/order/export.js

@@ -1,6 +1,6 @@
 const path = require("path")
 const fs = require("fs/promises")
-import { sep, resolve } from "path"
+import { resolve, sep } from "path"
 
 const setupServer = require("../../../../helpers/setup-server")
 const { useApi } = require("../../../../helpers/use-api")
@@ -31,7 +31,6 @@ describe("Batchjob with type order-export", () => {
       cwd,
       redisUrl: "redis://127.0.0.1:6379",
       uploadDir: __dirname,
-      verbose: false,
     })
   })