feat: Store backups in separate top-level directory

[sds]

Why is this change needed?

This allows the backups directory to be mounted on a separate volume so that it doesn't take away from the main storage volume.

Merge Checklist

• PR title adheres to the conventional commits standard
• PR has a changeset
• PR has been tagged with a change label(s) (i.e. documentation, feature, bugfix, or chore)
• PR includes documentation if necessary.

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PR-Codex overview

This PR focuses on improving the backup functionality in the RocksDB implementation by changing the backup directory structure and enhancing logging.

Detailed summary

• Updated the log message format for creating a snapshot.
• Changed the main_backup_path construction to place backups in a dedicated backup directory, which is a sibling of the main_db_path.
• Adjusted the backup file naming format to include a timestamp.

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Name	Status	Preview	Comments	Updated (UTC)
hub-monorepo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 28, 2024 6:38am

[changeset-bot]

🦋 Changeset detected

Latest commit: 7c04e6f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@farcaster/hubble	Patch

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