Logging level and log file rotation/retention should be configurable via the config file

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## Feature request

**Which Nextcloud Version are you currently using:** (see administration page)
3.16.4

**Is your feature request related to a problem? Please describe.**
Yes, Nextcloud logs too much by default, just the last 12 hours it has created 79 log files under ~/.config/Nextcloud/logs

**Describe the solution you'd like**
Options in the config file to set the log level for the desktop client (~/.config/Nextcloud/nextcloud.cfg). Not everyone needs full INFO level logs on at all times

**Describe alternatives you've considered**
My workaround is mounting the ~/.config/Nextcloud/logs folder as tmpfs to avoid excessive disk writes

**Additional context**
Add any other context or screenshots about the feature request here.