Add StartTime field in GetTraceSummaries API response for each TraceSummary.

Author: aws-sdk-dotnet-automation

generator/ServiceModels/xray/xray-2016-04-12.api.json

@@ -1818,6 +1818,7 @@
       "type":"structure",
       "members":{
         "Id":{"shape":"TraceId"},
+        "StartTime":{"shape":"Timestamp"},
         "Duration":{"shape":"NullableDouble"},
         "ResponseTime":{"shape":"NullableDouble"},
         "HasFault":{"shape":"NullableBoolean"},

generator/ServiceModels/xray/xray-2016-04-12.docs.json

@@ -1460,6 +1460,7 @@
         "Service$EndTime": "<p>The end time of the last segment that the service generated.</p>",
         "TelemetryRecord$Timestamp": "<p/>",
         "TimeSeriesServiceStatistics$Timestamp": "<p>Timestamp of the window for which statistics are aggregated.</p>",
+        "TraceSummary$StartTime": "<p>The start time of a trace, based on the earliest trace segment start time.</p>",
         "TraceSummary$MatchedEventTime": "<p>The matched time stamp of a defined event.</p>"
       }
     },