🔢 Implement server-side DAV pagination

[sorbaugh]

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Description

Currently, iOS is limited in execution time and data/memory consumption. There is very little available memory and a PROPFIND of a few hundred records is enough to cause an overflow. Therefore, not having pagination, every time a single item changes you have to reload the entire folder with an incalculable waste of time and resources.

Something like a limit to 50 files per query/run would be good.

There are 3 closed PRs that wanted to tackle this problem, we could think of a new approach or "revive" this one if it's more pragmatic.

https://github.com/sabre-io/dav/pull/1074/files

nextcloud/3rdparty#139

#10880