MC-34298: Introduce separate POST and PUT API for carts/mine/items

Author: engcom-Echo

app/code/Magento/Quote/etc/di.xml

@@ -16,6 +16,8 @@
     <preference for="Magento\Quote\Api\Data\AddressInterface" type="Magento\Quote\Model\Quote\Address" />
     <preference for="Magento\Quote\Api\Data\CartItemInterface" type="Magento\Quote\Model\Quote\Item" />
     <preference for="Magento\Quote\Api\Data\CartInterface" type="Magento\Quote\Model\Quote" />
+    <preference for="Magento\Quote\Api\AddCartItemInterface" type="Magento\Quote\Model\Quote\Item\AddCartItem" />
+    <preference for="Magento\Quote\Api\UpdateCartItemInterface" type="Magento\Quote\Model\Quote\Item\UpdateCartItem" />
     <preference for="Magento\Quote\Api\CartItemRepositoryInterface" type="Magento\Quote\Model\Quote\Item\Repository" />
     <preference for="Magento\Quote\Api\CartRepositoryInterface" type="Magento\Quote\Model\QuoteRepository" />
     <preference for="Magento\Quote\Api\Data\CartSearchResultsInterface" type="Magento\Quote\Model\CartSearchResults" />