Feature request: Android App: allow export of only settings and non-up subscriptions

[thefeiter]

💡 Idea

Full exports tend to get pretty big when using as Unified push provider. I am currently stripping down a full backup with jq: jq 'del(.notifications[]) | del( .subscriptions[] | select(.upAppId) )'.

Usually one can live without backing up all messages and the unified push subscriptions are set up via the respective apps anyway....

💻 Target components
Android App