StudyProgramSubjectProfessor management

Modification of http://185.153.49.63/sp/SIIS23such that we will display list of professors instead of credits/dependencies for each subject. It should allow to add or remove a professor from the subject.

The page should also have an option to add all teachers for each subject from the other study programs, regardless of the study program (select all unique professors that are assigned to a StudyProgramSubjectProfessor joined to StudyProgramSubject for the given subject).

There should be similar action to add all teachers to all subjects from the study program (execute the previous action to all displayed study programs).

url: /programs/{SIIS23}/edit-professors