Add javascript method to set oc_preferences

[rullzer]

As indicated by https://github.com/owncloud/core/blob/master/core/js/config.js#L58 we need a proper way to set preferences via javascript.

Then we could convert #19354 to use per user preferences instead of global.

CC: @PVince81

[PVince81]

Is there an OCS API for that ?
The one that comes to mind is a different one and is called "privatedata".

[PVince81]

moving to backlog. If these APIs are needed by features, they should be added as part of it.

[PVince81]

I don't think it's a good idea as it would open a way for users to change arbitrary values in their preferences and potentially break things. Changing arbitrary values is something I'd only leave up to an admin.

For now, apps need to use their own endpoints to set specific user preferences as needed.

[lock]

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