Remove checked in generated code

pom.xml

@@ -295,7 +295,7 @@
         <artifactId>protobuf-maven-plugin</artifactId>
         <version>0.6.1</version>
         <configuration>
-          <protocArtifact>com.google.protobuf:protoc:3.17.2:exe:${os.detected.classifier}</protocArtifact>
+          <protocArtifact>com.google.protobuf:protoc:3.18.0:exe:${os.detected.classifier}</protocArtifact>
         </configuration>
         <executions>
           <execution>

websocket-resources/src/main/proto/WebSocketProtocol.proto

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2020 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+syntax = "proto2";
+
+package signalservice;
+
+option java_package = "org.whispersystems.websocket.messages.protobuf";
+option java_outer_classname = "SubProtocol";
+
+message WebSocketRequestMessage {
+  optional string verb = 1;
+  optional string path = 2;
+  optional bytes body = 3;
+  repeated string headers = 5;
+  optional uint64 id = 4;
+}
+
+message WebSocketResponseMessage {
+  optional uint64 id = 1;
+  optional uint32 status = 2;
+  optional string message = 3;
+  repeated string headers = 5;
+  optional bytes body = 4;
+}
+
+message WebSocketMessage {
+  enum Type {
+    UNKNOWN = 0;
+    REQUEST = 1;
+    RESPONSE = 2;
+  }
+
+  optional Type type = 1;
+  optional WebSocketRequestMessage request = 2;
+  optional WebSocketResponseMessage response = 3;
+}