[AWS] inquiry shard number api gateway

{
  "StreamName": "api-kds",
  "Data": "$util.base64Encode($input.body)",
  "PartitionKey": "$context.requestId"
}

{
   "StreamName": "$input.params('stream')"
}

{
    "stream-name": "$input.params('stream')",
    "shard-count": $input.json('$.StreamDescriptionSummary.OpenShardCount')
}