Provide an easy check to categorize errors

[3lvis]

Provide an easy check to categorize errors

[3lvis]

/**
 Categorizes a status code.
 - `Informational`: This class of status code indicates a provisional response, consisting only of the Status-Line and optional headers, and is terminated by an empty line.
 - `Successful`: This class of status code indicates that the client's request was successfully received, understood, and accepted.
 - `Redirection`: This class of status code indicates that further action needs to be taken by the user agent in order to fulfill the request.
 - `ClientError:` The 4xx class of status code is intended for cases in which the client seems to have erred.
 - `ServerError:` Response status codes beginning with the digit "5" indicate cases in which the server is aware that it has erred or is incapable of performing the request.
 */
public enum NetworkingStatusCodeType {
    case Informational, Successful, Redirection, ClientError, ServerError
}

[3lvis]

Partly added in 665a282, I think we might not need to check for 1XX, 2XX and 3XX.