Add ExecuteBatch method to NFT interface for batch command execution

nft.go

@@ -103,3 +103,7 @@ func (n *nft) Rule() nftContract.Rule {
 func (n *nft) Command() contract.Command {
 	return n.command
 }
+
+func (n *nft) ExecuteBatch(batch contract.Batch) error {
+	return n.command.Run(batch.Args()...)
+}