Add multisign batch command (cosmos#7787)

* initial commit

* update signing data

* Update signature

* code cleanup

* code cleanup

* Add test for ms batch

* update test

* add build flag

* update flags

* update tests

* add test for signbatch multisig

* update test

* fix sign batch multisig

* add test

* update offline usage

* update with sign batch fix

* fix lint

* update tests

* update test

* update tests

* fix signature only

* update seq

* fix conflicts

* update multisign

* revert unintended

* fix tests

* rename flags

* code refactor

* fix typo

* update docs

* update test

* Update x/auth/client/cli/tx_multisign.go

* use named return values and explicit return

* Update x/auth/client/cli/tx_multisign.go

Co-authored-by: Robert Zaremba <robert@zaremba.ch>

* Update x/auth/client/cli/tx_multisign.go

Co-authored-by: Robert Zaremba <robert@zaremba.ch>

Co-authored-by: Alessio Treglia <alessio@tendermint.com>
Co-authored-by: Jonathan Gimeno <jonathan@tendermint.com>
Co-authored-by: Jonathan Gimeno <jgimeno@gmail.com>
Co-authored-by: Robert Zaremba <robert@zaremba.ch>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

simd/cmd/root.go

@@ -136,6 +136,7 @@ func txCommand() *cobra.Command {
 		authcmd.GetSignCommand(),
 		authcmd.GetSignBatchCommand(),
 		authcmd.GetMultiSignCommand(),
+		authcmd.GetMultiSignBatchCmd(),
 		authcmd.GetValidateSignaturesCommand(),
 		flags.LineBreak,
 		authcmd.GetBroadcastCommand(),