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>

fuzz/fuzz_targets/linux_loader.rs

@@ -8,15 +8,15 @@
 
 #![no_main]
 
-use std::ffi;
 use std::fs::File;
-use std::io;
 use std::io::{Seek, SeekFrom, Write};
 use std::os::unix::io::{FromRawFd, RawFd};
+use std::{ffi, io};
 
 use libfuzzer_sys::fuzz_target;
 use linux_loader::loader::KernelLoader;
-use vm_memory::{bitmap::AtomicBitmap, GuestAddress};
+use vm_memory::bitmap::AtomicBitmap;
+use vm_memory::GuestAddress;
 
 type GuestMemoryMmap = vm_memory::GuestMemoryMmap<AtomicBitmap>;