Add rustfmt.toml and cargo fmt (#23238)

* fmt

* formatted

Co-authored-by: Lucas B <buffalu@jito.network>

sdk/program/src/example_mocks.rs

@@ -24,10 +24,10 @@ pub mod solana_client {
     }
 
     pub mod rpc_client {
-        use super::super::solana_sdk::{
-            hash::Hash, signature::Signature, transaction::Transaction,
+        use super::{
+            super::solana_sdk::{hash::Hash, signature::Signature, transaction::Transaction},
+            client_error::Result as ClientResult,
         };
-        use super::client_error::Result as ClientResult;
 
         pub struct RpcClient;
 
@@ -63,12 +63,7 @@ pub mod solana_client {
 /// This lets examples in solana-program appear to be written as client
 /// programs.
 pub mod solana_sdk {
-    pub use crate::hash;
-    pub use crate::instruction;
-    pub use crate::message;
-    pub use crate::nonce;
-    pub use crate::pubkey;
-    pub use crate::system_instruction;
+    pub use crate::{hash, instruction, message, nonce, pubkey, system_instruction};
 
     pub mod signature {
         use crate::pubkey::Pubkey;
@@ -103,11 +98,10 @@ pub mod solana_sdk {
     }
 
     pub mod transaction {
-        use super::signers::Signers;
-        use crate::hash::Hash;
-        use crate::instruction::Instruction;
-        use crate::message::Message;
-        use crate::pubkey::Pubkey;
+        use {
+            super::signers::Signers,
+            crate::{hash::Hash, instruction::Instruction, message::Message, pubkey::Pubkey},
+        };
 
         pub struct Transaction {
             pub message: Message,

sdk/program/src/slot_hashes.rs

@@ -2,13 +2,12 @@
 //!
 //! this account carries the Bank's most recent bank hashes for some N parents
 //!
+pub use crate::clock::Slot;
 use {
     crate::hash::Hash,
     std::{iter::FromIterator, ops::Deref},
 };
 
-pub use crate::clock::Slot;
-
 pub const MAX_ENTRIES: usize = 512; // about 2.5 minutes to get your vote in
 
 // This is to allow tests with custom slot hash expiry to avoid having to generate