feat: ADR-040: add state sync for v2 store

CHANGELOG.md

@@ -59,6 +59,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * [\#10311](https://github.com/cosmos/cosmos-sdk/pull/10311) Adds cli to use tips transactions. It adds an `--aux` flag to all CLI tx commands to generate the aux signer data (with optional tip), and a new `tx aux-to-fee` subcommand to let the fee payer gather aux signer data and broadcast the tx
 * [\#10430](https://github.com/cosmos/cosmos-sdk/pull/10430) ADR-040: Add store/v2 `MultiStore` implementation
 * [\#10614](https://github.com/cosmos/cosmos-sdk/pull/10614) Support in-place migration ordering
+* [\#10794](https://github.com/cosmos/cosmos-sdk/pull/10794) ADR-040: Add State Sync to V2 Store
 
 ### API Breaking Changes
 

proto/cosmos/base/store/v1beta1/snapshot.proto

@@ -10,7 +10,9 @@ message SnapshotItem {
   // item is the specific type of snapshot item.
   oneof item {
     SnapshotStoreItem store = 1;
-    SnapshotIAVLItem  iavl  = 2 [(gogoproto.customname) = "IAVL"];
+    SnapshotIAVLItem  iavl = 2 [(gogoproto.customname) = "IAVL"];
+    SnapshotKVItem    kv = 3 [(gogoproto.customname) = "KV"];
+    SnapshotSchema schema = 4;
   }
 }
 
@@ -21,8 +23,19 @@ message SnapshotStoreItem {
 
 // SnapshotIAVLItem is an exported IAVL node.
 message SnapshotIAVLItem {
-  bytes key     = 1;
-  bytes value   = 2;
+  bytes key = 1;
+  bytes value = 2;
   int64 version = 3;
-  int32 height  = 4;
+  int32 height = 4;
+}
+
+// SnapshotKVItem is an exported Key/Value Pair
+message SnapshotKVItem {
+  bytes key = 1;
+  bytes value = 2;
+}
+
+// SnapshotSchema is an exported schema of store
+message SnapshotSchema{
+  repeated bytes keys = 1;
 }