feat(cmd): add new Lightweight option to BGSAVE cmd #3057
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ltagliamonte-dd
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Current backups create full copies of all files, doubling disk space usage.
This PR adds a lightweight backup mode that uses RocksDB checkpoints with hard links instead of copies, cutting space usage in half.
Ideal for use cases like backoffice data inserts, it lets you pause writes, create and upload a backup without doubling disk space, then resume writes quickly and efficiently.
This makes backups faster, leaner, and much more storage-friendly!
TODO: add unit tests