chore: convert ibc_middleware file back to .go

golang/cosmos/go.mod

@@ -29,6 +29,7 @@ require (
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.19.0
 	github.com/stretchr/testify v1.9.0
+	github.com/tendermint/tendermint v0.35.9
 	github.com/tendermint/tm-db v0.6.7
 	google.golang.org/genproto/googleapis/api v0.0.0-20240814211410-ddb44dafa142
 	google.golang.org/grpc v1.67.0
@@ -42,9 +43,11 @@ require (
 	cloud.google.com/go/compute/metadata v0.5.0 // indirect
 	cloud.google.com/go/iam v1.1.9 // indirect
 	cloud.google.com/go/storage v1.41.0 // indirect
+	cosmossdk.io/client/v2 v2.0.0-beta.3 // indirect
 	cosmossdk.io/collections v0.4.0 // indirect
 	cosmossdk.io/core v0.11.1 // indirect
 	cosmossdk.io/depinject v1.0.0 // indirect
+	cosmossdk.io/x/circuit v0.1.1 // indirect
 	cosmossdk.io/x/tx v0.13.5 // indirect
 	filippo.io/edwards25519 v1.1.0 // indirect
 	github.com/99designs/go-keychain v0.0.0-20191008050251-8e49817e8af4 // indirect