Include all flags in performance tool auto-completion script

Some flags were added dynamically with mixins, so they
would not be included in the auto-completion script.

Fixes #232

Author: acogoluegnes

src/test/java/com/rabbitmq/stream/perf/AggregatingCommandForAutoComplete.java

@@ -0,0 +1,28 @@
+// Copyright (c) 2022 VMware, Inc. or its affiliates.  All rights reserved.
+//
+// This software, the RabbitMQ Stream Java client library, is dual-licensed under the
+// Mozilla Public License 2.0 ("MPL"), and the Apache License version 2 ("ASL").
+// For the MPL, please see LICENSE-MPL-RabbitMQ. For the ASL,
+// please see LICENSE-APACHE2.
+//
+// This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
+// either express or implied. See the LICENSE file for specific language governing
+// rights and limitations of this software.
+//
+// If you have any questions regarding licensing, please contact us at
+// [email protected].
+package com.rabbitmq.stream.perf;
+
+import picocli.CommandLine;
+
+public class AggregatingCommandForAutoComplete {
+
+  @CommandLine.Mixin private final StreamPerfTest streamPerfTest = new StreamPerfTest();
+
+  @CommandLine.Mixin
+  private final DebugEndpointMonitoring monitoring = new DebugEndpointMonitoring();
+
+  @CommandLine.Mixin
+  private final PrometheusEndpointMonitoring prometheusEndpointMonitoring =
+      new PrometheusEndpointMonitoring();
+}