Migrate x/auth cmd's to TxGenerator marshaling (#6391)

* Migrate encode, decode, and broadcast cmd's to use TxGenerator marshal methods

* Fix tests, add EncodingConfig

* Add simapp/encoding.go and wire up with simcli

* add godocs

* fix tests

* Debugging CLI Tests

* Fix integration test

* 6391 - lint issues and code coverage (#6414)

* fixed lint issue of "txEncodeRespStr"

* added tests for encode.go

* WIP: added tests for decode.go

* added txEncoder at bytes

* updated decode test

* updated txBytes to use TxEncoder in decoder test

* added a require after TxEncoder

* removed file save

* debug decode command

* fixed decode tests

* added decode cli

* updated encode and decode in a single file

* separated decode test from encode test

* review changes

* removed register interface

* review change

* Fix tests

* WIP add test for tx sign

* removed commented code

* Fix flags

* WIP add test for sign

* Address review suggestions

* fixed command issue

* Add tests for TxEncoder

* Revert sign changes

* Fix TxEncoder tests

* Fix GetSign Cmd

* Add tx test

* Remove duplicate validation

* Add tests for TxDecoder

* Fix tests

* Fix tests

* Output to clientCtx.Output

* Fix cli_tests

Co-authored-by: atheeshp <59333759+atheeshp@users.noreply.github.com>
Co-authored-by: atheesh <atheesh@vitwit.com>
Co-authored-by: anilCSE <anil@vitwit.com>
Co-authored-by: sahith-narahari <sahithnarahari@gmail.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

codec/testdata/test_helper.go

@@ -1,8 +1,9 @@
 package testdata
 
 import (
-	"github.com/cosmos/cosmos-sdk/codec/types"
 	"github.com/tendermint/go-amino"
+
+	"github.com/cosmos/cosmos-sdk/codec/types"
 )
 
 func NewTestInterfaceRegistry() types.InterfaceRegistry {