feat: cross-platform backup - WPB-16658

[github-actions]

WPB-16658 Cross Platform Backup

This PR was automatically cherry-picked based on the following PR:

• feat: cross-platform backup - WPB-16658 #2889

Original PR description:

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Issue

This PR:

• integrates a cross-platform framework for creating backups,
• adds a feature flag to create backups using the old way

Testing

Create a backup and import it on other platforms clients.

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Checklist

• Title contains a reference JIRA issue number like [WPB-XXX].
• Description is filled and free of optional paragraphs.
• Adds/updates automated tests.

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UI accessibility checklist

If your PR includes UI changes, please utilize this checklist:

• Make sure you use the API for UI elements that support large fonts.
• All colors are taken from WireDesign.ColorTheme or constructed using WireDesign.BaseColorPalette.
• New UI elements have Accessibility strings for VoiceOver.

[github-actions]

Test Results

    8 files    918 suites   10m 33s ⏱️
6 375 tests 6 344 ✅ 27 💤 4 ❌
6 387 runs  6 360 ✅ 27 💤 0 ❌

For more details on these failures, see this check.

Results for commit 83ad6b1.

[datadog-wireapp]

Datadog Report

Branch report: feat/cross-platform-backup-WPB-16658-cherry-pick
Commit report: 2c432de
Test service: wire-ios-mono

✅ 0 Failed, 6360 Passed, 27 Skipped, 4m 28.26s Total Time
❄️ 2 New Flaky

New Flaky Tests (2)

• test_Login_withEmail() - WireUITests.WireAuthenticationTests - Last Failure

  Expand for error

   Test has failed
  

• test_Login_withWrongEmail_NextIsDisabled() - WireUITests.WireAuthenticationTests - Last Failure

  Expand for error

   Test has failed