feat(core/store): make KVStore structurally typed (#21222)

core/CHANGELOG.md

@@ -55,6 +55,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
     * Add `PreMsghandler`and `PostMsgHandler` for pre and post message hooks
     * Add `MsgHandler` as an alternative to grpc handlers
     * Provide separate `MigrationRegistrar` instead of grouping with `RegisterServices`
+* [#21222](https://github.com/cosmos/cosmos-sdk/pull/21222) Make `Iterator` a type alias so that `KVStore` is structurally typed.
 
 ### API Breaking Changes
 

core/store/store.go

@@ -87,7 +87,7 @@ type KVStoreWithBatch interface {
 //
 // Callers must make sure the iterator is valid before calling any methods on it,
 // otherwise these methods will panic.
-type Iterator interface {
+type Iterator = interface {
 	// Domain returns the start (inclusive) and end (exclusive) limits of the iterator.
 	Domain() (start, end []byte)