Change the get data stream api to include the following properties of a data stream:

- ~~Add `index_mode` from `DataStream` to the response.~~
- For each backing index of a data stream with time series index mode, include the temporal range the backing index represents (based on the `index.time_series.start_time` and `index.time_series.end_time` index settings.
modules/data-streams/src/test/java/org/elasticsearch/datastreams/action/GetDataStreamsTransportActionTests.java
/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
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package org.elasticsearch.datastreams.action;
import org.elasticsearch.action.datastreams.GetDataStreamAction;
import org.elasticsearch.cluster.ClusterName;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.metadata.DataStream;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.core.Tuple;
import org.elasticsearch.index.IndexNotFoundException;
import org.elasticsearch.indices.TestIndexNameExpressionResolver;
import org.elasticsearch.test.ESTestCase;
import java.util.List;
import static org.elasticsearch.cluster.metadata.DataStreamTestHelper.getClusterStateWithDataStreams;
import static org.hamcrest.Matchers.containsString;
import static org.hamcrest.Matchers.equalTo;
public class GetDataStreamsTransportActionTests extends ESTestCase {