add --limit_load_slot_count_from_snapshot to ledger-tool (#17417)

ledger/src/blockstore_processor.rs

@@ -368,6 +368,7 @@ pub struct ProcessOptions {
     pub debug_keys: Option<Arc<HashSet<Pubkey>>>,
     pub account_indexes: AccountSecondaryIndexes,
     pub accounts_db_caching_enabled: bool,
+    pub limit_load_slot_count_from_snapshot: Option<usize>,
     pub allow_dead_slots: bool,
     pub accounts_db_test_hash_calculation: bool,
 }