Add studieinfo to the database

Right now studieinfo is a static json file, which is far too large to reasonably load at once. This data should be split up, so only one start year has to be loaded at a time, in order to reduce the size of the data sent. The necessary tables have to be added to the database and the data also need to be populated. The data population should be done by using a backend endpoint which is protected by an api key.