Change Scrapper Scheduler to be Major Based

[fairuzi10]

This issue is a:

• bug report
• feature request
• styling change request

Current behavior:

Currently, we are running the scrapper scheduler every one hour for all majors. This will make scrapped schedules outdated for pretty long (1 hour). If we run the scheduler in a shorter time, there's a concern that SIAK will block our IP or even block our SSO accounts, which is pretty bad since we collected credentials from so many people across majors and faculties.

Requested behavior:

Change the scrapper to be major-based. We may need to add last_updated field in major. If someone with major X logged in and the last_updated of X is 5 minutes or more before now, we will run the scrapper.

Why this behavior is better:

We will save many unnecessary requests we're doing currently.