fixup! fixup! Add durable Raft metadata storage

crates/metadata-store/src/raft/storage.rs

@@ -8,3 +8,45 @@
 // the Business Source License, use of this software will be governed
 // by the Apache License, Version 2.0.
 
+use std::sync::Arc;
+use raft::{GetEntriesContext, RaftState, Storage};
+use raft::eraftpb::{Entry, Snapshot};
+use rocksdb::DB;
+use restate_rocksdb::RocksDb;
+
+struct RocksDbStorage {
+    db: Arc<DB>,
+    rocksdb: Arc<RocksDb>,
+}
+
+impl RocksDbStorage {
+    pub fn new() -> Self {
+        unimplemented!()
+    }
+}
+
+impl Storage for RocksDbStorage {
+    fn initial_state(&self) -> raft::Result<RaftState> {
+        todo!()
+    }
+
+    fn entries(&self, low: u64, high: u64, max_size: impl Into<Option<u64>>, context: GetEntriesContext) -> raft::Result<Vec<Entry>> {
+        todo!()
+    }
+
+    fn term(&self, idx: u64) -> raft::Result<u64> {
+        todo!()
+    }
+
+    fn first_index(&self) -> raft::Result<u64> {
+        todo!()
+    }
+
+    fn last_index(&self) -> raft::Result<u64> {
+        todo!()
+    }
+
+    fn snapshot(&self, request_index: u64, to: u64) -> raft::Result<Snapshot> {
+        todo!()
+    }
+}