Implement backup functionality for redb

[msk]

This change adds the ability to backup the redb database to a file. It also moves all backup-related methods of Store to the backup module, in order to keep the lib.rs file clean.

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 68.62745% with 16 lines in your changes missing coverage. Please review.

Project coverage is 66.58%. Comparing base (38885a9) to head (a4ede4b).

Files with missing lines	Patch %	Lines
src/backup.rs	65.95%	16 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## redb #347 +/- ## ========================================== + Coverage 66.56% 66.58% +0.02% ========================================== Files 99 99 Lines 20513 20545 +32 ========================================== + Hits 13654 13680 +26 - Misses 6859 6865 +6 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[msk]

We will directly use redb.