WAITING FOR OTTO - feat: ✨  Add Filtering by Quarters Functionality
Description
- Adds the concept of AcademicPeriod and AcademicLevel to Job Offers
 - AcademicPeriods are automatically determined based on the contractStartDate and contractEndDate
 - AcademicLevel is defined during the creation of Job Offers
 - Adds the ability to filter by AcademicPeriod on the view all job offers page
 
Related Issues
- Resolves #122 (closed)
 
Checklist
- 
I have added a changelog entry to reflect the significant changes I made.  
Edited  by Timur Oberhuber