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>

virtio-devices/src/block.rs

@@ -8,23 +8,18 @@
 //
 // SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
 
-use std::collections::BTreeMap;
-use std::collections::HashMap;
-use std::collections::VecDeque;
-use std::io;
+use std::collections::{BTreeMap, HashMap, VecDeque};
 use std::num::Wrapping;
 use std::ops::Deref;
 use std::os::unix::io::AsRawFd;
 use std::path::PathBuf;
-use std::result;
 use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
 use std::sync::{Arc, Barrier};
+use std::{io, result};
 
 use anyhow::anyhow;
-use block::{
-    async_io::AsyncIo, async_io::AsyncIoError, async_io::DiskFile, build_serial, Request,
-    RequestType, VirtioBlockConfig,
-};
+use block::async_io::{AsyncIo, AsyncIoError, DiskFile};
+use block::{build_serial, Request, RequestType, VirtioBlockConfig};
 use rate_limiter::group::{RateLimiterGroup, RateLimiterGroupHandle};
 use rate_limiter::TokenType;
 use seccompiler::SeccompAction;
@@ -39,15 +34,14 @@ use vm_migration::{Migratable, MigratableError, Pausable, Snapshot, Snapshottabl
 use vm_virtio::AccessPlatform;
 use vmm_sys_util::eventfd::EventFd;
 
-use super::Error as DeviceError;
 use super::{
-    ActivateError, ActivateResult, EpollHelper, EpollHelperError, EpollHelperHandler, VirtioCommon,
-    VirtioDevice, VirtioDeviceType, VirtioInterruptType, EPOLL_HELPER_EVENT_LAST,
+    ActivateError, ActivateResult, EpollHelper, EpollHelperError, EpollHelperHandler,
+    Error as DeviceError, VirtioCommon, VirtioDevice, VirtioDeviceType, VirtioInterruptType,
+    EPOLL_HELPER_EVENT_LAST,
 };
 use crate::seccomp_filters::Thread;
 use crate::thread_helper::spawn_virtio_thread;
-use crate::GuestMemoryMmap;
-use crate::VirtioInterrupt;
+use crate::{GuestMemoryMmap, VirtioInterrupt};
 
 const SECTOR_SHIFT: u8 = 9;
 pub const SECTOR_SIZE: u64 = 0x01 << SECTOR_SHIFT;