refactor: remove unused imports from various files

src/modes/get.rs

@@ -1,7 +1,6 @@
 use anyhow::anyhow;
 
 use crate::compression::CompressionType;
-// use std::io::BufWriter;  // Removed unused import
 use crate::modes::common::ColumnType;
 use clap::Command;
 use std::path::PathBuf;