chore: apply review feedback

 - move all function of `wasmplus/keeper/keeper_extension.go` to `wasmplus/keeper/keeper.go`
 - remove no need files (keeper_extension.go, metrics.go)

x/wasmplus/keeper/keeper.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/line/lbm-sdk/codec"
 	sdk "github.com/line/lbm-sdk/types"
+	sdkerrors "github.com/line/lbm-sdk/types/errors"
 	bankpluskeeper "github.com/line/lbm-sdk/x/bankplus/keeper"
 	paramtypes "github.com/line/lbm-sdk/x/params/types"
 	"github.com/line/ostracon/libs/log"
@@ -18,7 +19,7 @@ type Keeper struct {
 	wasmkeeper.Keeper
 	cdc      codec.Codec
 	storeKey sdk.StoreKey
-	metrics  *Metrics
+	metrics  *wasmkeeper.Metrics
 	bank     bankpluskeeper.Keeper
 }
 
@@ -48,9 +49,8 @@ func NewKeeper(
 	result := Keeper{
 		cdc:      cdc,
 		storeKey: storeKey,
-		metrics:  NopMetrics(),
+		metrics:  wasmkeeper.NopMetrics(),
 		bank:     bankPlusKeeper,
-		//paramSpace: paramSpace,
 	}
 	result.Keeper = wasmkeeper.NewKeeper(
 		cdc,
@@ -89,3 +89,62 @@ func (Keeper) Logger(ctx sdk.Context) log.Logger {
 func ModuleLogger(ctx sdk.Context) log.Logger {
 	return ctx.Logger().With("module", fmt.Sprintf("x/%s", types.ModuleName))
 }
+
+func (k Keeper) IsInactiveContract(ctx sdk.Context, contractAddress sdk.AccAddress) bool {
+	store := ctx.KVStore(k.storeKey)
+	return store.Has(types.GetInactiveContractKey(contractAddress))
+}
+
+func (k Keeper) IterateInactiveContracts(ctx sdk.Context, fn func(contractAddress sdk.AccAddress) (stop bool)) {
+	store := ctx.KVStore(k.storeKey)
+	prefix := types.InactiveContractPrefix
+	iterator := sdk.KVStorePrefixIterator(store, prefix)
+	defer iterator.Close()
+
+	for ; iterator.Valid(); iterator.Next() {
+		contractAddress := sdk.AccAddress(iterator.Value())
+		if stop := fn(contractAddress); stop {
+			break
+		}
+	}
+}
+
+func (k Keeper) addInactiveContract(ctx sdk.Context, contractAddress sdk.AccAddress) {
+	store := ctx.KVStore(k.storeKey)
+	key := types.GetInactiveContractKey(contractAddress)
+
+	store.Set(key, contractAddress)
+}
+
+func (k Keeper) deleteInactiveContract(ctx sdk.Context, contractAddress sdk.AccAddress) {
+	store := ctx.KVStore(k.storeKey)
+	key := types.GetInactiveContractKey(contractAddress)
+	store.Delete(key)
+}
+
+// activateContract delete the contract address from inactivateContract list if the contract is deactivated.
+func (k Keeper) activateContract(ctx sdk.Context, contractAddress sdk.AccAddress) error {
+	if !k.IsInactiveContract(ctx, contractAddress) {
+		return sdkerrors.Wrapf(wasmtypes.ErrNotFound, "no inactivate contract %s", contractAddress.String())
+	}
+
+	k.deleteInactiveContract(ctx, contractAddress)
+	k.bank.DeleteFromInactiveAddr(ctx, contractAddress)
+
+	return nil
+}
+
+// deactivateContract add the contract address to inactivateContract list.
+func (k Keeper) deactivateContract(ctx sdk.Context, contractAddress sdk.AccAddress) error {
+	if k.IsInactiveContract(ctx, contractAddress) {
+		return sdkerrors.Wrapf(wasmtypes.ErrAccountExists, "already inactivate contract %s", contractAddress.String())
+	}
+	if !k.HasContractInfo(ctx, contractAddress) {
+		return sdkerrors.Wrapf(wasmtypes.ErrInvalid, "no contract %s", contractAddress.String())
+	}
+
+	k.addInactiveContract(ctx, contractAddress)
+	k.bank.AddToInactiveAddr(ctx, contractAddress)
+
+	return nil
+}