SetLogFormat sets the default format for the logger.

TODO: "set" on the name doesn't make sense, as it isn't receiving nothing to set.

UseEnvs set the logger level to the specified in SHELLHUB_LOG_LEVEL and the log format for SHELLHUB_LOG_FORMAT.

LogFormatJSON format for JSON log.

LogFormatText format for text log.

LogFormat represents how logger should print logs.