Add version numbers to shared preferences

[limwa]

We should think of a way to add version number to the app's shared preferences.
This is important in situations where we want to manually invalidate the user's session to trigger certain behavior that only happens when the user logins.

To do this, I thought of a few approaches, but feel free to suggest other approaches.

1. Have a version number per property. This allows for a finer level of invalidation, but might add a lot of complexity where it isn't needed.
2. Have a version number for all properties. This allows for a lower level of complexity but reduces the level of invalidation.

One thing to consider is that if we have a single version number for all properties is that when the version number is incremented, the consent to the cookie banner is reset. Is this a problem?