Enhance logs

[volbap]

The current logs don't display the parameters attached to the request, the body of the response, the headers, among other stuff...

It would be cool to have a variable to define the log level:

var logLevel: LogLevel = .default

enum LogLevel {
    case off // Equivalent to turning the logs of in current version
    case default // Equivalent to current logs
    case verbose // New logs including more information
}