Reformat imports to a consistent style for imports

rustfmt.toml configuration:
        imports_granularity = "One"
         group_imports = "One"

core/src/system_monitor_service.rs

@@ -8,7 +8,6 @@ use std::{
     thread::{self, sleep, Builder, JoinHandle},
     time::{Duration, Instant},
 };
-
 #[cfg(target_os = "linux")]
 use std::{fs::File, io::BufReader, path::Path};