feat(lightclient): Add tx for setting canonical light client (#1681)

* Added tx for setting canonical light client.

* linter

---------

Co-authored-by: Michael Tsitrin <michael@dymension.xyz>

x/lightclient/client/cli/tx.go

@@ -0,0 +1,59 @@
+package cli
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+
+	"github.com/cosmos/cosmos-sdk/client"
+	"github.com/cosmos/cosmos-sdk/client/flags"
+	"github.com/cosmos/cosmos-sdk/client/tx"
+
+	"github.com/dymensionxyz/dymension/v3/x/lightclient/types"
+)
+
+// GetTxCmd returns the transaction commands for this module
+func GetTxCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:                        types.ModuleName,
+		Short:                      fmt.Sprintf("%s transactions subcommands", types.ModuleName),
+		DisableFlagParsing:         true,
+		SuggestionsMinimumDistance: 2,
+		RunE:                       client.ValidateCmd,
+	}
+
+	cmd.AddCommand(NewSetCanonicalClientTxCmd())
+
+	return cmd
+}
+
+func NewSetCanonicalClientTxCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:     "set-canonical-client [client-id]",
+		Short:   "Try and set the canonical client for a rollapp",
+		Example: "dymd tx lightclient set-canonical-client <client-id>",
+		Long:    `Try and set the canonical client for a rollapp.`,
+		Args:    cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) (err error) {
+			clientCtx, err := client.GetClientTxContext(cmd)
+			if err != nil {
+				return err
+			}
+			clientId := args[0]
+
+			msg := &types.MsgSetCanonicalClient{
+				Signer:   clientCtx.GetFromAddress().String(),
+				ClientId: clientId,
+			}
+
+			if err := msg.ValidateBasic(); err != nil {
+				return err
+			}
+			return tx.GenerateOrBroadcastTxCLI(clientCtx, cmd.Flags(), msg)
+		},
+	}
+
+	flags.AddTxFlagsToCmd(cmd)
+
+	return cmd
+}

x/lightclient/module.go

@@ -84,7 +84,7 @@ func (AppModuleBasic) RegisterGRPCGatewayRoutes(clientCtx client.Context, mux *r
 
 // GetTxCmd returns the module's root tx command.
 func (a AppModuleBasic) GetTxCmd() *cobra.Command {
-	return nil
+	return cli.GetTxCmd()
 }
 
 // GetQueryCmd returns the module's root query command.