Add homescreen widgets

[nilsreichardt]

Description

This is a general ticket for the feature request of adding homescreen widgets. Later we should split all widget into seperate tickets (for each widget and each platform a ticket).

Disclaimer: We plan to make the widgets part of our Sharezone Plus subscription.

Ideas for homescreen widgets:

• Today timetable (with room)
• List of homework (ideally with checkbox)
• Add homework (opens homework dialog)
• "Nächste Stunde: Deutsch (D201)"

GitLab tickets:

• https://gitlab.com/codingbrain/sharezone/sharezone-app/-/issues/517
• https://gitlab.com/codingbrain/sharezone/sharezone-app/-/issues/1189

[Arbee4ever]

I'd also appreciate if there was a widget that showed the current/next lesson with the room, so you can quickly find that info without needing to open the app. (Also idk how that works, but I'd make it work on the iPad lockscreen aswell)

[nilsreichardt]

We should be able to the following widgets with the home_widget:

• Today Timetable
• Open homework
• Add a new homework

In the next months I will implement a prototype for the widgets 👍