Snapshot Packaging Service (#5262)

* Snapshot serialization and packaging

multinode-demo/bootstrap-leader.sh

@@ -62,6 +62,7 @@ args+=(
   --ledger "$ledger_dir"
   --rpc-port 8899
   --snapshot-path "$SOLANA_CONFIG_DIR"/bootstrap-leader/snapshots
+  --snapshot-interval-slots 100
   --storage-keypair "$storage_keypair"
   --voting-keypair "$vote_keypair"
   --rpc-drone-address 127.0.0.1:9900

multinode-demo/validator.sh

@@ -263,6 +263,7 @@ default_arg --storage-keypair "$storage_keypair_path"
 default_arg --ledger "$ledger_config_dir"
 default_arg --accounts "$accounts_config_dir"
 default_arg --snapshot-path "$snapshot_config_dir"
+default_arg --snapshot-interval-slots 100
 
 if [[ -n $SOLANA_CUDA ]]; then
   program=$solana_validator_cuda