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>

net_util/src/ctrl_queue.rs

@@ -16,8 +16,7 @@ use virtio_queue::{Queue, QueueT};
 use vm_memory::{ByteValued, Bytes, GuestMemoryError};
 use vm_virtio::{AccessPlatform, Translatable};
 
-use crate::GuestMemoryMmap;
-use crate::Tap;
+use crate::{GuestMemoryMmap, Tap};
 
 #[derive(Debug)]
 pub enum Error {