Paginate contacts list

[ChristophWurst]

Is your feature request related to a problem? Please describe.

As a user with many contacts the loading times of the app decrease with the rise of data in my address books.

Describe the solution you'd like

Do not load the full address book at page load. Only load the fist x contacts and load more when I scroll.

Work Package

• cdav-library feat: add pagination cdav-library#919
• backend feat: add pagination compatibility to cardav backend server#47909
• Frontend (WIP) feat: pagination #4125
• Implement proper search (currently only frontend)
• Sabre https://github.com/hamza221/dav/pull/1/files
• Tests

Describe alternatives you've considered

N/a

Additional context

• Related to 🔢 Implement server-side DAV pagination server#45102

[ChristophWurst]

https://datatracker.ietf.org/doc/html/rfc6352#section-8.6.1 this might be a good start. What it doesn't say is how you can request more data with a given cursor/offset.

E.g.

1. REPORT or the first 20 contacts ordered by FN
2. REPORT for 20 contacts that come after "Bob" (or position 20 if we must use offsets)