Add cmd for db flattening #160
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Flattening an LSM (Log-Structured Merge-tree) database improves performance by reducing read amplification and decreasing the number of SSTables (Sorted String Tables) that need to be scanned during queries. In the context of LSM databases, data is initially written to a memory table (memtable) and then flushed to disk as immutable SSTables. Over time, these SSTables accumulate, leading to increased read costs. Flattening merges these SSTables, simplifying the data structure and significantly enhancing read efficiency.