CORE-18550: add payload reply from gateway (#1395)

* CORE-18550: add ack reply from gateway

* Apply review comment

* Bump API version post merge

data/avro-schema/src/main/resources/avro/net/corda/data/p2p/gateway/GatewayResponse.avsc

@@ -8,6 +8,14 @@
       "name": "id",
       "type": "string",
       "doc": "The id of the request corresponding to this response."
+    },
+    {
+      "name": "payload",
+      "type": [
+        "null",
+        "net.corda.data.p2p.crypto.AuthenticatedEncryptedDataMessage",
+        "net.corda.data.p2p.crypto.AuthenticatedDataMessage"
+      ]
     }
   ]
 }

gradle.properties

@@ -5,7 +5,7 @@ cordaProductVersion = 5.2.0
 # NOTE: update this each time this module contains a breaking change
 ## NOTE: currently this is a top level revision, so all API versions will line up, but this could be moved to
 ##   a per module property in which case module versions can change independently.
-cordaApiRevision = 15
+cordaApiRevision = 16
 
 # Main
 kotlin.stdlib.default.dependency = false