Backup improvements & example

XXMessengerClient library

• Fix race condition issues when starting the backup and setting initial parameters.
• Add BackupStorage utility that can store the backup.
• Store BackupStorage.Backup on disk.

xx-messenger example

• Start backup
• Resume backup
• Stop backup
• Store backups in storage
• Observe backup storage
• Export backup from storage
• Resume backup on launch

assigned to @darrarski.xx

requested review from @brunomunizaf

changed the description

added 4 commits

• c4fdba3c - Refactor
• e22c3daf - Update MessengerFileManager
• c2c18618 - Create BackupStorage.onDisk implementation
• d89f26a2 - Update example app

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added 1 commit

• efc1f346 - Update BackupView

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marked the checklist item Store BackupStorage.Backup on disk. as completed

marked this merge request as ready

enabled an automatic merge when the pipeline for efc1f346 succeeds

aborted the automatic merge because source branch was updated

added 1 commit

• aabd0d05 - Try to resume backup on launch

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enabled an automatic merge when the pipeline for aabd0d05 succeeds

aborted the automatic merge because source branch was updated

added 1 commit

• 90d0e9a0 - Test CI

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• 0070b7bb - Revert "Test CI"

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enabled an automatic merge when the pipeline for 0070b7bb succeeds

mentioned in commit c15b6a04

merged