Rename AccountsPacakge to SnapshotPackage and AccountsPackagePre to AccountsPackage (#19231)

Renaming these types to better communicate their usages, which will
further diverge as incremental snapshot support is added.

With the new names, AccountsPacakge now refers to the type between
AccountsBackgroundProcess and AccountsHashVerifier, and SnapshotPackage
refers to the type between AccountsHashVerifier and
SnapshotPackagerService.

runtime/src/snapshot_utils.rs

@@ -13,7 +13,7 @@ use {
             FullSnapshotArchiveInfo, IncrementalSnapshotArchiveInfo, SnapshotArchiveInfoGetter,
         },
         snapshot_package::{
-            AccountsPackage, AccountsPackagePre, AccountsPackageSendError, AccountsPackageSender,
+            AccountsPackage, AccountsPackageSendError, AccountsPackageSender, SnapshotPackage,
         },
         sorted_storages::SortedStorages,
     },
@@ -239,9 +239,9 @@ pub fn remove_tmp_snapshot_archives(snapshot_archives_dir: &Path) {
     }
 }
 
-/// Make a full snapshot archive out of the AccountsPackage
+/// Make a full snapshot archive out of the snapshot package
 pub fn archive_snapshot_package(
-    snapshot_package: &AccountsPackage,
+    snapshot_package: &SnapshotPackage,
     maximum_snapshots_to_retain: usize,
 ) -> Result<()> {
     info!(
@@ -1549,7 +1549,7 @@ pub fn snapshot_bank(
     let highest_bank_snapshot_info = get_highest_bank_snapshot_info(snapshots_dir)
         .expect("no snapshots found in config snapshots_dir");
 
-    let package = AccountsPackagePre::new_full_snapshot_package(
+    let accounts_package = AccountsPackage::new_for_full_snapshot(
         root_bank,
         &highest_bank_snapshot_info,
         snapshots_dir,
@@ -1561,7 +1561,7 @@ pub fn snapshot_bank(
         hash_for_testing,
     )?;
 
-    accounts_package_sender.send(package)?;
+    accounts_package_sender.send(accounts_package)?;
 
     Ok(())
 }
@@ -1666,7 +1666,7 @@ pub fn package_process_and_archive_full_snapshot(
     thread_pool: Option<&ThreadPool>,
     maximum_snapshots_to_retain: usize,
 ) -> Result<FullSnapshotArchiveInfo> {
-    let package = AccountsPackagePre::new_full_snapshot_package(
+    let accounts_package = AccountsPackage::new_for_full_snapshot(
         bank,
         bank_snapshot_info,
         snapshots_dir,
@@ -1678,14 +1678,16 @@ pub fn package_process_and_archive_full_snapshot(
         None,
     )?;
 
-    let package = process_and_archive_snapshot_package_pre(
-        package,
+    let snapshot_package = process_and_archive_accounts_package(
+        accounts_package,
         thread_pool,
         None,
         maximum_snapshots_to_retain,
     )?;
 
-    Ok(FullSnapshotArchiveInfo::new(package.snapshot_archive_info))
+    Ok(FullSnapshotArchiveInfo::new(
+        snapshot_package.snapshot_archive_info,
+    ))
 }
 
 /// Helper function to hold shared code to package, process, and archive incremental snapshots
@@ -1702,7 +1704,7 @@ pub fn package_process_and_archive_incremental_snapshot(
     thread_pool: Option<&ThreadPool>,
     maximum_snapshots_to_retain: usize,
 ) -> Result<IncrementalSnapshotArchiveInfo> {
-    let package = AccountsPackagePre::new_incremental_snapshot_package(
+    let accounts_package = AccountsPackage::new_for_incremental_snapshot(
         bank,
         incremental_snapshot_base_slot,
         bank_snapshot_info,
@@ -1715,8 +1717,8 @@ pub fn package_process_and_archive_incremental_snapshot(
         None,
     )?;
 
-    let package = process_and_archive_snapshot_package_pre(
-        package,
+    let snapshot_package = process_and_archive_accounts_package(
+        accounts_package,
         thread_pool,
         Some(incremental_snapshot_base_slot),
         maximum_snapshots_to_retain,
@@ -1724,30 +1726,33 @@ pub fn package_process_and_archive_incremental_snapshot(
 
     Ok(IncrementalSnapshotArchiveInfo::new(
         incremental_snapshot_base_slot,
-        package.snapshot_archive_info,
+        snapshot_package.snapshot_archive_info,
     ))
 }
 
-/// Helper function to hold shared code to process and archive snapshot packages
-fn process_and_archive_snapshot_package_pre(
-    package_pre: AccountsPackagePre,
+/// Helper function to hold shared code to process and archive accounts packages
+fn process_and_archive_accounts_package(
+    accounts_package: AccountsPackage,
     thread_pool: Option<&ThreadPool>,
     incremental_snapshot_base_slot: Option<Slot>,
     maximum_snapshots_to_retain: usize,
-) -> Result<AccountsPackage> {
-    let package =
-        process_accounts_package_pre(package_pre, thread_pool, incremental_snapshot_base_slot);
+) -> Result<SnapshotPackage> {
+    let snapshot_package = process_accounts_package(
+        accounts_package,
+        thread_pool,
+        incremental_snapshot_base_slot,
+    );
 
-    archive_snapshot_package(&package, maximum_snapshots_to_retain)?;
+    archive_snapshot_package(&snapshot_package, maximum_snapshots_to_retain)?;
 
-    Ok(package)
+    Ok(snapshot_package)
 }
 
-pub fn process_accounts_package_pre(
-    accounts_package: AccountsPackagePre,
+pub fn process_accounts_package(
+    accounts_package: AccountsPackage,
     thread_pool: Option<&ThreadPool>,
     incremental_snapshot_base_slot: Option<Slot>,
-) -> AccountsPackage {
+) -> SnapshotPackage {
     let mut time = Measure::start("hash");
 
     let hash = accounts_package.hash; // temporarily remaining here
@@ -1789,7 +1794,7 @@ pub fn process_accounts_package_pre(
         ),
     };
 
-    AccountsPackage::new(
+    SnapshotPackage::new(
         accounts_package.slot,
         accounts_package.block_height,
         accounts_package.slot_deltas,