Centralized user preferences/settings

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Description

New features are starting to have the requirement to save user preferences to the database (for example the last view a user selected for a board) and I'm worried that we might end up with these littered around if there's no guidance.

Specifically, new features are asking for "Your selection choice is saved to your user, so that if you log into GitLab from any device, your previous selection persists"

Proposal

Either have a 'best practices' document laying out how to properly implement new preferences, or add a library to do this in a generic manner.