Added env vars for logging
- One env var `SAS_LOG_TO_FILE` to give the option to log to files or not. - One env var `SAS_PATH_TO_LOG_FILES` to specify a custom path where file logs are saved.
- One env var `SAS_LOG_TO_FILE` to give the option to log to files or not. - One env var `SAS_PATH_TO_LOG_FILES` to specify a custom path where file logs are saved.