Add SSTable#8
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This PR introduces the SSTable, the on-disk sorted string table used to persist flushed MemTable data
SSTable::new— flushes a MemTable to a level-partitioned .sstable file, recording per-entry byte offsets for O(log n) binary searchSSTable::load_from_path— reconstructs an SSTable (offsets, low/high keys) by scanning an existing file on diskSSTable::key_in_range— cheaply checks whether a key falls within the table's min/max bounds before doing a full lookupSSTable::get— binary searches the offset index to locate an entry without scanning the entire file; supports tombstone entries (deleted keys)Tests cover: file format correctness, loading from disk, range checks (including boundaries), get for present/deleted/missing keys, single-entry edge cases, and binary search against first/last entries.
Blog article: https://adambcomer.com/blog/simple-database/sstable/