feat: implement SwapEncoder for Hashflow

config/protocol_specific_addresses.json

@@ -9,6 +9,9 @@
     "rfq:bebop": {
       "bebop_settlement_address": "0xbbbbbBB520d69a9775E85b458C58c648259FAD5F",
       "native_token_address": "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE"
+    },
+    "rfq:hashflow": {
+      "hashflow_router_address": "0x55084eE0fEf03f14a305cd24286359A35D735151"
     }
   },
   "base": {
@@ -18,4 +21,4 @@
     }
   },
   "unichain": {}
-}
+}