KAFKA-10599: Implement basic CLI tool for feature versioning system (#…

…9409)

This PR implements a basic CLI tool for feature versioning system. The KIP-584 write up has been updated to suit this PR. The following is implemented in this PR:

--describe:
Describe supported and finalized features.
Usage: $> ./bin/kafka-features.sh --bootstrap-server host1:port1, host2:port2 --describe [--from-controller] [--command-config <path_to_java_properties_file>]
Optionally, use the --from-controller option to get features from the controller.
--upgrade-all:
Upgrades all features known to the tool to their highest max version levels.
Usage: $> ./bin/kafka-features.sh --bootstrap-server host1:port1, host2:port2 --upgrade-all [--dry-run] [--command-config <path_to_java_properties_file>]
Optionally, use the --dry-run CLI option to preview the feature updates without actually applying them.
--downgrade-all:
Downgrades existing finalized features to the highest max version levels known to this tool.
Usage: $> ./bin/kafka-features.sh --bootstrap-server host1:port1, host2:port2 --downgrade-all [--dry-run] [--command-config <path_to_java_properties_file>].
Optionally, use the --dry-run CLI option to preview the feature updates without actually applying them.

Reviewers: Boyang Chen <boyang@confluent.io>, Jun Rao <junrao@gmail.com>

bin/kafka-features.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+# 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.
+
+exec $(dirname $0)/kafka-run-class.sh kafka.admin.FeatureCommand "$@"