Transaction signing and encoding (#95)

* WIP setting up evm tx command and updating emint keys output

* Fix linting issue

* Wip restructuring to allow for ethereum signing and encoding

* WIP setting up keybase and context to use Ethermint keys

* Fixed encoding and decoding of emint keys

* Adds command for generating explicit ethereum tx

* Fixed evm route for handling tx

* Fixed tx and msg encoding which allows transactions to be sent

* Added relevant documentation for changes and cleaned up code

* Added documentation and indicators why code was overriden

cmd/emintcli/main.go

@@ -13,6 +13,9 @@ import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	emintkeys "github.com/cosmos/ethermint/keys"
 
+	authcmd "github.com/cosmos/cosmos-sdk/x/auth/client/cli"
+	bankcmd "github.com/cosmos/cosmos-sdk/x/bank/client/cli"
+
 	emintapp "github.com/cosmos/ethermint/app"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
@@ -48,7 +51,7 @@ func main() {
 		sdkrpc.StatusCommand(),
 		client.ConfigCmd(emintapp.DefaultCLIHome),
 		queryCmd(cdc),
-		// TODO: Set up tx command
+		txCmd(cdc),
 		// TODO: Set up rest routes (if included, different from web3 api)
 		rpc.Web3RpcCmd(cdc),
 		client.LineBreak,
@@ -83,6 +86,28 @@ func queryCmd(cdc *amino.Codec) *cobra.Command {
 	return queryCmd
 }
 
+func txCmd(cdc *amino.Codec) *cobra.Command {
+	txCmd := &cobra.Command{
+		Use:   "tx",
+		Short: "Transactions subcommands",
+	}
+
+	txCmd.AddCommand(
+		bankcmd.SendTxCmd(cdc),
+		client.LineBreak,
+		authcmd.GetSignCommand(cdc),
+		client.LineBreak,
+		authcmd.GetBroadcastCommand(cdc),
+		authcmd.GetEncodeCommand(cdc),
+		client.LineBreak,
+	)
+
+	// add modules' tx commands
+	emintapp.ModuleBasics.AddTxCommands(txCmd, cdc)
+
+	return txCmd
+}
+
 func initConfig(cmd *cobra.Command) error {
 	home, err := cmd.PersistentFlags().GetString(cli.HomeFlag)
 	if err != nil {