Update ante handlers to use SignatureV2 (cosmos#6428)

* Update ante handlers to use SignatureV2

* WIP on test fixes

* WIP on test fixes

* Debugging CLI Tests

* CHANGELOG.md

* CHANGELOG

* Add missing tests for ante

* Add tests for verify signatures

* Update verify tests

* Fix register codec issue

* debug

* Cleanup

* Fix verify signature tests

* Remove viper

* remove keyring usage

* Fix review changes

* Fix simapp

* Fix ante tests

* Add reference issue

* Add test for multisignature

* Wrap sign error with sig

* Fix verify sign test

* Fix CHANGELOG.md

Co-authored-by: sahith-narahari <sahithnarahari@gmail.com>
Co-authored-by: anilCSE <anil@vitwit.com>
Co-authored-by: Federico Kunze <31522760+fedekunze@users.noreply.github.com>
Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>

app.go

@@ -373,6 +373,7 @@ func NewSimApp(
  app.SetAnteHandler(
  ante.NewAnteHandler(
  app.AccountKeeper, app.BankKeeper, *app.IBCKeeper, ante.DefaultSigVerificationGasConsumer,
+ authtypes.LegacyAminoJSONHandler{},
  ),
  )
  app.SetEndBlocker(app.EndBlocker)