Be able to configure Mapnik's logger severity level through options #25
Description
Mapnik uses stdout for logging and we might want to decide what to do with them.
$ node
> const mapnik = require('@carto/mapnik');
undefined
> mapnik.Logger
{ [Function: Logger]
getSeverity: [Function: getSeverity],
setSeverity: [Function: setSeverity],
NONE: 3,
ERROR: 2,
DEBUG: 0,
WARN: 1 }
> mapnik.Logger.getSeverity()
2
> mapnik.Logger.setSeverity(mapnik.Logger.NONE)
undefined
> mapnik.Logger.getSeverity()
3
@Algunenano, do you know what severity level we are setting for the logger while compiling @carto/mapnik?