refactor: introduce abciGenesis interface

CHANGELOG.md

@@ -48,6 +48,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (crypto/keyring) [#17503](https://github.com/cosmos/cosmos-sdk/pull/17503) Simplify keyring interfaces to use `[]byte` instead of `sdk.Address` for addresses.
 * (all) [#16537](https://github.com/cosmos/cosmos-sdk/pull/16537) Properly propagated `fmt.Errorf` errors and using `errors.New` where appropriate.
 * (rpc) [#17470](https://github.com/cosmos/cosmos-sdk/pull/17470) Avoid open 0.0.0.0 to public by default and add `listen-ip-address` argument for `testnet init-files` cmd.
+* (types/module) [#17554](https://github.com/cosmos/cosmos-sdk/pull/17554) Introduce `HasABCIGenesis` which is implemented by a module only when a validatorset update needs to be returned 
 
 ### Bug Fixes
 

core/appmodule/genesis.go

@@ -7,6 +7,7 @@ import (
 
 // HasGenesis is the extension interface that modules should implement to handle
 // genesis data and state initialization.
+// WARNING: This interface is experimental and may change at any time.
 type HasGenesis interface {
 	AppModule
 

types/module/core_module.go

@@ -19,7 +19,7 @@ import (
 
 var (
 	_ AppModuleBasic = coreAppModuleBasicAdaptor{}
-	_ HasGenesis     = coreAppModuleBasicAdaptor{}
+	_ HasABCIGenesis = coreAppModuleBasicAdaptor{}
 	_ HasServices    = coreAppModuleBasicAdaptor{}
 )
 
@@ -122,9 +122,12 @@ func (c coreAppModuleBasicAdaptor) InitGenesis(ctx sdk.Context, cdc codec.JSONCo
 	}
 
 	if mod, ok := c.module.(HasGenesis); ok {
+		mod.InitGenesis(ctx, cdc, bz)
+		return nil
+	}
+	if mod, ok := c.module.(HasABCIGenesis); ok {
 		return mod.InitGenesis(ctx, cdc, bz)
 	}
-
 	return nil
 }