Add "View Modelling Process Log" functionality

[LogIN-]

Add View Log functionality for users to be able to check the model building process.

TODO: Separate log file per user.

Current main SIMON processing log file is located here: /var/log/simon-cron.log

• Split log files per user and queue as: cat /var/log/simon-cron-{{user_id}}-{{queue_id}}.log
• Add option on SIMON frontend for user to be able to see current processing log in real-time
• Implement backend API to support this functionality