Add km module kafka gateway

clients/build/resources/main/common/message/HeartbeatRequest.json

@@ -0,0 +1,38 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+{
+  "apiKey": 12,
+  "type": "request",
+  "name": "HeartbeatRequest",
+  // Version 1 and version 2 are the same as version 0.
+  //
+  // Starting from version 3, we add a new field called groupInstanceId to indicate member identity across restarts.
+  //
+  // Version 4 is the first flexible version.
+  "validVersions": "0-4",
+  "flexibleVersions": "4+",
+  "fields": [
+    { "name": "GroupId", "type": "string", "versions": "0+", "entityType": "groupId",
+      "about": "The group id." },
+    { "name": "GenerationId", "type": "int32", "versions": "0+",
+      "about": "The generation of the group." },
+    { "name": "MemberId", "type": "string", "versions": "0+",
+      "about": "The member ID." },
+    { "name": "GroupInstanceId", "type": "string", "versions": "3+",
+      "nullableVersions": "3+", "default": "null",
+      "about": "The unique identifier of the consumer instance provided by end user." }
+  ]
+}