Add nonce in API server orders endpoints

Author: OBorce

api-server/api-server-common/src/storage/impls/in_memory/mod.rs

@@ -822,6 +822,8 @@ impl ApiServerInMemoryStorage {
         Ok(())
     }
 
+    // The NFT owner is updated in both cases when it is spent as an input and transfered or
+    // created as an output. When the amount is 0 we set the owner to None as in the case of a Burn
     fn update_nft_owner(
         &mut self,
         coin_or_token_id: CoinOrTokenId,

api-server/web-server/src/api/json_helpers.rs

@@ -514,5 +514,6 @@ pub fn order_to_json(
         "ask_currency": coins_or_token_to_json(&order.ask_currency, chain_config),
         "initially_asked": amount_to_json(order.initially_asked, ask_currency_decimals),
         "ask_balance": amount_to_json(order.ask_balance, ask_currency_decimals),
+        "nonce": order.next_nonce,
     })
 }