function isLambdaProxyEvent(event) {
  return isGatewayV1ProxyEvent(event) || isGatewayV2ProxyEvent(event)
}
Determines if Lambda event appears to be a valid Lambda Proxy event.
There are multiple types of events possible. They are described at
https://docs.aws.amazon.com/lambda/latest/dg/services-apigateway.html#services-apigateway-apitypes.
Each type of event has its own event payload structure; some types have
multiple versions of the payload structure.

@param {object} event The event to inspect.
@returns {boolean} Whether the given object contains fields necessary
                   to create a web transaction.