Reformat imports to a consistent style for imports

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

sdk/src/process_instruction.rs

@@ -1,12 +1,14 @@
-use itertools::Itertools;
-use solana_sdk::{
-    account::AccountSharedData,
-    instruction::{CompiledInstruction, Instruction, InstructionError},
-    keyed_account::{create_keyed_accounts_unified, KeyedAccount},
-    pubkey::Pubkey,
-    sysvar::Sysvar,
+use {
+    itertools::Itertools,
+    solana_sdk::{
+        account::AccountSharedData,
+        instruction::{CompiledInstruction, Instruction, InstructionError},
+        keyed_account::{create_keyed_accounts_unified, KeyedAccount},
+        pubkey::Pubkey,
+        sysvar::Sysvar,
+    },
+    std::{cell::RefCell, collections::HashSet, fmt::Debug, rc::Rc, sync::Arc},
 };
-use std::{cell::RefCell, collections::HashSet, fmt::Debug, rc::Rc, sync::Arc};
 
 /// Prototype of a native loader entry point
 ///