Reformat imports to a consistent style for imports

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

frozen-abi/src/abi_digester.rs

@@ -1,12 +1,16 @@
-use crate::abi_example::{normalize_type_name, AbiEnumVisitor};
-use crate::hash::{Hash, Hasher};
-use log::*;
-use serde::ser::Error as SerdeError;
-use serde::ser::*;
-use serde::{Serialize, Serializer};
-use std::any::type_name;
-use std::io::Write;
-use thiserror::Error;
+use {
+    crate::{
+        abi_example::{normalize_type_name, AbiEnumVisitor},
+        hash::{Hash, Hasher},
+    },
+    log::*,
+    serde::{
+        ser::{Error as SerdeError, *},
+        Serialize, Serializer,
+    },
+    std::{any::type_name, io::Write},
+    thiserror::Error,
+};
 
 #[derive(Debug)]
 pub struct AbiDigester {
@@ -538,8 +542,7 @@ impl SerializeStructVariant for AbiDigester {
 
 #[cfg(test)]
 mod tests {
-    use std::collections::HashMap;
-    use std::sync::atomic::AtomicIsize;
+    use std::{collections::HashMap, sync::atomic::AtomicIsize};
 
     #[frozen_abi(digest = "CQiGCzsGquChkwffHjZKFqa3tCYtS3GWYRRYX7iDR38Q")]
     type TestTypeAlias = i32;

frozen-abi/src/abi_example.rs

@@ -1,9 +1,9 @@
-use crate::abi_digester::{AbiDigester, DigestError, DigestResult};
-
-use log::*;
-
-use serde::Serialize;
-use std::any::type_name;
+use {
+    crate::abi_digester::{AbiDigester, DigestError, DigestResult},
+    log::*,
+    serde::Serialize,
+    std::any::type_name,
+};
 
 pub trait AbiExample: Sized {
     fn example() -> Self;

frozen-abi/src/hash.rs

@@ -1,5 +1,7 @@
-use sha2::{Digest, Sha256};
-use std::{convert::TryFrom, fmt};
+use {
+    sha2::{Digest, Sha256},
+    std::{convert::TryFrom, fmt},
+};
 
 const HASH_BYTES: usize = 32;
 #[derive(AbiExample)]