feat!: Define Genesis state transition (#15999)

core/CHANGELOG.md

@@ -38,4 +38,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### API-Breaking Changes
 
-- (store)[14635](https://github.com/cosmos/cosmos-sdk/pull/14635) Add error handling to all methods on the `KVStore` interface
+* (store)[14635](https://github.com/cosmos/cosmos-sdk/pull/14635) Add error handling to all methods on the `KVStore` interface
+
+### Features
+
+* (genesis) [#15999](https://github.com/cosmos/cosmos-sdk/pull/15999) Add `GenesisTxHandler` interface

core/genesis/txhandler.go

@@ -0,0 +1,6 @@
+package genesis
+
+// TxHandler is an interface that modules can implement to provide genesis state transitions
+type TxHandler interface {
+	ExecuteGenesisTx([]byte) error
+}