add new api for events

Is your feature request related to a problem? Please describe. HTWK changes with Projektmotor the Event information infrastructure and we have to adopt our fetcher to gether all data from https://stage.luna.htwk-leipzig.de/api/docs

Describe the solution you'd like Rewrite fetcher in v3 for additional Event Fetching. Projektmotor said that its the "single source of truth"

Describe alternatives you've considered Alternative is to contact HTWK internals to get own access or rewrite internal infrastructure, because this api isnt a reactive one. Information Updates are done by fetching and getting informations from an manual file. Best case every 10min or every hour.