misc: Further improve imports styling

By introducing `imports_granularity="Module"` format strategy,
effectively groups imports from the same module into one line or block,
improving maintainability and readability.

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

performance-metrics/src/main.rs

@@ -8,13 +8,11 @@ extern crate test_infra;
 
 mod performance_tests;
 
-use std::{
-    env, fmt,
-    process::Command,
-    sync::{mpsc::channel, Arc},
-    thread,
-    time::Duration,
-};
+use std::process::Command;
+use std::sync::mpsc::channel;
+use std::sync::Arc;
+use std::time::Duration;
+use std::{env, fmt, thread};
 
 use clap::{Arg, ArgAction, Command as ClapCommand};
 use performance_tests::*;