Chore: fix missing import in rocksstore-v2

Author: drmingdrmer

stores/rocksstore-v2/src/lib.rs

@@ -24,6 +24,7 @@ use openraft::storage::RaftLogStorage;
 use openraft::storage::RaftStateMachine;
 use openraft::storage::Snapshot;
 use openraft::AnyError;
+use openraft::BasicNode;
 use openraft::Entry;
 use openraft::EntryPayload;
 use openraft::ErrorVerb;