Use SpeziAccount @AccountKey macro to store user meta data

[nriedman]

Problem

At the moment, we manage notification settings via a custom UserMetaDataManager that listens to changes in the User document in Firestore and record information like organization affiliation and notification preferences. However, with the new version of SpeziAccount, this user meta might lend itself to being represented as @ApplicationKeys instead.

Solution

See if @ApplicationKeys would be a good fit for the use meta data, and if so replace the UserMetaDataManager with these macros. Update the settings views in the Account Sheet to use built in SpeziAccount views.

Additional context

No response

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