feat(medusa-react,medusa,types,dashboard): added empty state + table for promotions list page (#6827)

what:

- adds empty state for promotions list page
- lists all promotions with pagination

<img width="1663" alt="Screenshot 2024-03-26 at 14 19 27" src="https://github.com/medusajs/medusa/assets/5105988/ed0d5c65-d003-40f5-b899-540970d892f5">


<img width="1664" alt="Screenshot 2024-03-27 at 20 46 17" src="https://github.com/medusajs/medusa/assets/5105988/4aa40f09-fe3f-4f34-af7a-f5c183254c76">

packages/admin-next/dashboard/src/providers/router-provider/v2.tsx

@@ -77,6 +77,18 @@ export const v2Routes: RouteObject[] = [
               },
             ],
           },
+          {
+            path: "/promotions",
+            handle: {
+              crumb: () => "Promotions",
+            },
+            children: [
+              {
+                path: "",
+                lazy: () => import("../../v2-routes/promotions/promotion-list"),
+              },
+            ],
+          },
         ],
       },
     ],