Refactor EIP-712 signature verification (#1397)

* [WIP] EIP-712 Signature Refactor

* Debug and add ante tests

* Add tests for failure cases

* Add changelog entry

* Code cleanup

* Add tests for MsgDelegate and MsgWithdrawDelegationReward

* Update ethereum/eip712/encoding.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* Update ethereum/eip712/encoding.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* Update ethereum/eip712/encoding.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* Update ethereum/eip712/encoding.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* Update ethereum/eip712/encoding.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* Update ethereum/eip712/encoding.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* Code cleanup

* Update ethereum/eip712/encoding.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* Minor codefix

* Update ethereum/eip712/encoding.go

* Minor code revision updates

* Refactor EIP712 unit tests to use test suite

* Address import cycle and implement minor refactors

* Fix lint issues

* Add EIP712 unit suite test function

* Update ethereum/eip712/encoding.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* Update ethereum/eip712/encoding.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* Update ethereum/eip712/encoding.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* Add minor refactors; increase test coverage

* Correct ante_test for change in payload

* Add single-signer util and tests

* Update ethereum/eip712/encoding.go

* Update ethereum/eip712/encoding.go

* fix build

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>
Co-authored-by: Freddy Caceres <facs95@gmail.com>

cmd/ethermintd/root.go

@@ -37,6 +37,7 @@ import (
 	"github.com/evmos/ethermint/client/debug"
 	"github.com/evmos/ethermint/crypto/hd"
 	"github.com/evmos/ethermint/encoding"
+	"github.com/evmos/ethermint/ethereum/eip712"
 	"github.com/evmos/ethermint/server"
 	servercfg "github.com/evmos/ethermint/server/config"
 	srvflags "github.com/evmos/ethermint/server/flags"
@@ -61,6 +62,8 @@ func NewRootCmd() (*cobra.Command, params.EncodingConfig) {
 		WithKeyringOptions(hd.EthSecp256k1Option()).
 		WithViper(EnvPrefix)
 
+	eip712.SetEncodingConfig(encodingConfig)
+
 	rootCmd := &cobra.Command{
 		Use:   "ethermintd",
 		Short: "Ethermint Daemon",