Add test suite for client TxBuilder (#6460)

* Add tests

* Fix gofmt

* typecast tests

* Fix review comments

* typecast SigVerificableTx

* cleanup

* Refactor

* Linting and move encode/decode tests to suite

* Fix lint

* Move test suite

* godoc

* Refactor

* Refactor

Co-authored-by: Aaron Craelius <aaronc@users.noreply.github.com>
Co-authored-by: Aaron Craelius <aaron@regen.network>

x/auth/client/cli/encode_test.go

@@ -4,12 +4,13 @@ import (
 	"encoding/base64"
 	"testing"
 
+	"github.com/stretchr/testify/require"
+
 	"github.com/cosmos/cosmos-sdk/client"
 	simappparams "github.com/cosmos/cosmos-sdk/simapp/params"
 	"github.com/cosmos/cosmos-sdk/tests"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
-	"github.com/stretchr/testify/require"
 )
 
 func TestGetCommandEncode(t *testing.T) {