create courses_this_term endpoints

[Gavinok]

https://user-images.githubusercontent.com/44787178/255993559-68a62668-f7fd-4a45-b047-a3fe4956cc37.png

but change courses to courses_this_semester in endpoints

list of this

export interface ICourse {
    courseId: number
    courseCode: string;
    courseNumber: string;
    courseName: string;
    term: Term[];
}

get term from preferences api schema

[Gavinok]

NO DELETING!!!

[MMojtaba]

I believe we decided to drop the course/term table, and by extention this endpoint.
Frontend sends us list of courses and the term they are being scheduled for, and schedule objects kind of holds this information anyway (course start/end dates), so this endpoint wouldnt be needed.
I've made most of the code for this feature in branch courses_givenTerm just in case.