feat(medusa): Add metadata to StorePostCartsCartLineItemsItemReq (#4230)

integration-tests/api/__tests__/store/cart/cart.js

@@ -769,6 +769,9 @@ describe("/store/carts", () => {
           "/store/carts/test-cart-3/line-items/test-item3/",
           {
             quantity: 3,
+            metadata: {
+              another: "prop",
+            },
           },
           { withCredentials: true }
         )
@@ -782,6 +785,10 @@ describe("/store/carts", () => {
             variant_id: "test-variant-sale-cg",
             quantity: 3,
             adjustments: [],
+            metadata: {
+              "some-existing": "prop",
+              another: "prop",
+            },
           }),
         ])
       )

integration-tests/api/helpers/cart-seeder.js

@@ -938,6 +938,7 @@ module.exports = async (dataSource, data = {}) => {
     quantity: 1,
     variant_id: "test-variant-sale-cg",
     cart_id: "test-cart-3",
+    metadata: { "some-existing": "prop" },
   })
   await manager.save(li3)
 }