SASjs run command improvements

[krishna-acondy]

The sasjs run command still uses the old token mechanism that requires manual intervention to input an auth code.
If we can migrate this over to the mechanism used by the other commands, we can use the token stored in the .env file to run SAS code.

The log is currently output to the console, and not saved anywhere. It'd be good to be able to store it in a file.