Return a single message
stream-cli chat get-message [message-id] --output-format [json|tree] [flags]
# Returns a message with id 'msgid-1'
$ stream-cli chat get-message msgid-1
  -h, --help                   help for get-message
  -o, --output-format string   [optional] Output format. Can be json or tree (default "json")
      --app string      [optional] Application name to use as it's defined in the configuration file
      --config string   [optional] Explicit config file path