Add storage-proto build.rs and readme (#18353)

* Use build.rs for storage-proto generation

* Add readme

* Single use statements

storage-bigtable/src/access_token.rs

@@ -1,16 +1,18 @@
 /// A module for managing a Google API access token
-use goauth::{
-    auth::{JwtClaims, Token},
-    credentials::Credentials,
-};
-use log::*;
-use smpl_jwt::Jwt;
-use std::{
-    sync::{
-        atomic::{AtomicBool, Ordering},
-        {Arc, RwLock},
+use {
+    goauth::{
+        auth::{JwtClaims, Token},
+        credentials::Credentials,
+    },
+    log::*,
+    smpl_jwt::Jwt,
+    std::{
+        sync::{
+            atomic::{AtomicBool, Ordering},
+            {Arc, RwLock},
+        },
+        time::Instant,
     },
-    time::Instant,
 };
 
 pub use goauth::scopes::Scope;

storage-bigtable/src/bigtable.rs

@@ -1,16 +1,18 @@
 // Primitives for reading/writing BigTable tables
 
-use crate::{
-    access_token::{AccessToken, Scope},
-    compression::{compress_best, decompress},
-    root_ca_certificate,
-};
-use log::*;
-use std::time::{Duration, Instant};
-use thiserror::Error;
-use tonic::{
-    codegen::InterceptedService, metadata::MetadataValue, transport::ClientTlsConfig, Request,
-    Status,
+use {
+    crate::{
+        access_token::{AccessToken, Scope},
+        compression::{compress_best, decompress},
+        root_ca_certificate,
+    },
+    log::*,
+    std::time::{Duration, Instant},
+    thiserror::Error,
+    tonic::{
+        codegen::InterceptedService, metadata::MetadataValue, transport::ClientTlsConfig, Request,
+        Status,
+    },
 };
 
 mod google {

storage-bigtable/src/compression.rs

@@ -1,5 +1,7 @@
-use enum_iterator::IntoEnumIterator;
-use std::io::{self, BufReader, Read, Write};
+use {
+    enum_iterator::IntoEnumIterator,
+    std::io::{self, BufReader, Read, Write},
+};
 
 #[derive(Debug, Serialize, Deserialize, IntoEnumIterator)]
 pub enum CompressionMethod {

storage-bigtable/src/lib.rs

@@ -1,23 +1,24 @@
 #![allow(clippy::integer_arithmetic)]
-use log::*;
-use serde::{Deserialize, Serialize};
-use solana_sdk::{
-    clock::{Slot, UnixTimestamp},
-    deserialize_utils::default_on_eof,
-    pubkey::Pubkey,
-    signature::Signature,
-    sysvar::is_sysvar_id,
-    transaction::{Transaction, TransactionError},
+use {
+    log::*,
+    serde::{Deserialize, Serialize},
+    solana_sdk::{
+        clock::{Slot, UnixTimestamp},
+        deserialize_utils::default_on_eof,
+        pubkey::Pubkey,
+        signature::Signature,
+        sysvar::is_sysvar_id,
+        transaction::{Transaction, TransactionError},
+    },
+    solana_storage_proto::convert::{generated, tx_by_addr},
+    solana_transaction_status::{
+        ConfirmedBlock, ConfirmedTransaction, ConfirmedTransactionStatusWithSignature, Reward,
+        TransactionByAddrInfo, TransactionConfirmationStatus, TransactionStatus,
+        TransactionStatusMeta, TransactionWithStatusMeta,
+    },
+    std::{collections::HashMap, convert::TryInto},
+    thiserror::Error,
 };
-use solana_storage_proto::convert::generated;
-use solana_storage_proto::convert::tx_by_addr;
-use solana_transaction_status::{
-    ConfirmedBlock, ConfirmedTransaction, ConfirmedTransactionStatusWithSignature, Reward,
-    TransactionByAddrInfo, TransactionConfirmationStatus, TransactionStatus, TransactionStatusMeta,
-    TransactionWithStatusMeta,
-};
-use std::{collections::HashMap, convert::TryInto};
-use thiserror::Error;
 
 #[macro_use]
 extern crate serde_derive;

storage-bigtable/src/root_ca_certificate.rs

@@ -1,5 +1,7 @@
-use std::{fs::File, io::Read};
-use tonic::transport::Certificate;
+use {
+    std::{fs::File, io::Read},
+    tonic::transport::Certificate,
+};
 
 pub fn load() -> Result<Certificate, String> {
     // Respect the standard GRPC_DEFAULT_SSL_ROOTS_FILE_PATH environment variable if present,