feat: store encrypted backup in platform-native cloud

[daniel-mader]

Description of change

When enabled, all files and assets created by UniMe are compressed and encrypted with the user's password.
The archive is then uploaded to the platform-native cloud provider (iCloud, Google Drive).
When a new profile is created in UniMe, the user is presented with an option to restore an existing profile from a backup (if exists).

Links to any relevant issues

• closes Add Cloud back-up and Recovery functionalities #61
• depends on feat(core): add startIntentSenderForResult Android API for plugins tauri-apps/tauri#12682

How the change has been tested

n/a

Definition of Done checklist

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• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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