Live sync KV stores over Iroh

crates/geth-kv/src/lib.rs

@@ -16,6 +16,13 @@ pub struct KvEntry {
     pub value: String,
 }
 
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct KvSyncEntry {
+    pub key: String,
+    pub value: String,
+    pub updated_at_ms: i64,
+}
+
 #[derive(Debug, thiserror::Error)]
 pub enum KvError {
     #[error("invalid kv store name: {0}")]