Moving/Copying many files takes ages.

It looks like it is trying to make a request to the server for every single file and then refreshing the folder.
This is unacceptable. It must be one single request to the server like:
```
op: "move"
from: "FolderA"
to: "FolderB"
files: ["file1.jpg","file2.jpg", ....]
```

At the moment to move 500 files from one folder to another takes about 5 minutes.

### Environment data
Android version: Android 10

Device model: Moto One Macro

Stock or customized system: stock

Nextcloud app version: 3.18.1

Nextcloud server version: 22.2.3