feat: Create cart with line items (#6449)

**What**
- Add support for creating a cart with items
- Add endpoint `POST /store/carts/:id/line-items`
- Add `CreateCartWorkflow`
- Add `AddToCartWorkflow`
- Add steps for both workflows

**Testing**
- Endpoints
- Workflows

I would still call this a first iteration, as we are missing a few pieces of the full flow, such as payment sessions, discounts, and taxes.

Co-authored-by: Adrien de Peretti <25098370+adrien2p@users.noreply.github.com>

packages/medusa/src/api/middlewares/error-handler.ts

@@ -1,7 +1,7 @@
 import { NextFunction, Request, Response } from "express"
 
-import { Logger } from "../../types/global"
 import { MedusaError } from "medusa-core-utils"
+import { Logger } from "../../types/global"
 import { formatException } from "../../utils"
 
 const QUERY_RUNNER_RELEASED = "QueryRunnerAlreadyReleasedError"