feat(pwa): allow access elk users from service worker

[userquin]

This PR includes:

• change elk-users storage to IDB-keyval: useIDBKeyval
• add sw logic to use elk-users and find the corresponding notification on backend
• on push notification click, open the notification page instead just notification or notification/mention ones (current behavior)

This opens the doors to:

• group notifications, even by server
• add custom actions on push notification: for example, reply in the own system notification
• we can add these new features progressively (PWA ;) )

/cc @danielroe @TodePond

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[patak-dev]

I think we should still read from local storage and move the users to idb, then remove the key from LS. If not, everyone needs to re-login, no?

[danielroe]

Agreed - keeping it backwards-compatible would be nice 🙏

[userquin]

I need to review the redirection: check backward compatibility on users.ts, added users initialization function

[patak-dev]

I think we can merge after other reviews, and test in main for a couple of days. We should probably not do releases in the next two days.

[patak-dev]

@danielroe merging so we can test it. We can later check if we could reduce the duplication of types.