chanbackup: archive old channel backups

[Abdulkbk]

Fixes #8906

Change Description

This PR fixes the issue. By default, it archives channels backups rather than deletes them when new backups are to be saved. The archives are saved with timestamped names to make them easy to find.

Steps to Test

When you start/stop a node and a new backup is about to be written, the previous backup (if available) will be copied to a "channelarchives" folder in the same directory as the main backup file.

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