Add support for staking module tx MsgCreateValidator (#14)

Part of [laconicd testnet validator enrollment](https://www.notion.so/laconicd-testnet-validator-enrollment-6fc1d3cafcc64fef8c5ed3affa27c675)

Co-authored-by: Prathamesh Musale <prathamesh.musale0@gmail.com>
Co-authored-by: Adw8 <adwaitgharpure@gmail.com>
Reviewed-on: cerc-io/laconic-wallet#14

src/screens/ApproveTransaction.tsx

@@ -1,15 +1,16 @@
-import React, { useCallback, useEffect, useState } from 'react';
+import React, { useCallback, useEffect, useMemo, useState } from 'react';
 import { Image, ScrollView, View } from 'react-native';
 import { Button, Text, TextInput } from 'react-native-paper';
 import { SvgUri } from 'react-native-svg';
 import Config from 'react-native-config';
+import { MsgCreateValidator } from 'cosmjs-types/cosmos/staking/v1beta1/tx';
 
 import {
   NativeStackNavigationProp,
   NativeStackScreenProps,
 } from '@react-navigation/native-stack';
 import { useNavigation } from '@react-navigation/native';
-import { DirectSecp256k1Wallet } from '@cosmjs/proto-signing';
+import { DirectSecp256k1Wallet, EncodeObject } from '@cosmjs/proto-signing';
 import { LaconicClient } from '@cerc-io/registry-sdk';
 import { GasPrice, calculateFee } from '@cosmjs/stargate';
 import { formatJsonRpcError } from '@json-rpc-tools/utils';
@@ -42,7 +43,6 @@ const ApproveTransaction = ({ route }: ApproveTransactionProps) => {
   const requestName = requestSession.peer.metadata.name;
   const requestIcon = requestSession.peer.metadata.icons[0];
   const requestURL = requestSession.peer.metadata.url;
-  const transactionMessage = route.params.transactionMessage;
   const signer = route.params.signer;
   const requestEvent = route.params.requestEvent;
   const chainId = requestEvent.params.chainId;
@@ -69,6 +69,20 @@ const ApproveTransaction = ({ route }: ApproveTransactionProps) => {
   );
   const namespace = requestedNetwork!.namespace;
 
+  const transactionMessage = useMemo((): EncodeObject => {
+    const inputTxMsg = route.params.transactionMessage;
+
+    // If it's a MsgCreateValidator, decode the tx msg value using MsgCreateValidator type
+    if (inputTxMsg.typeUrl.includes('MsgCreateValidator')) {
+      return {
+        typeUrl: inputTxMsg.typeUrl,
+        value: MsgCreateValidator.fromJSON(inputTxMsg.value),
+      };
+    }
+
+    return inputTxMsg;
+  }, [route.params.transactionMessage]);
+
   useEffect(() => {
     if (namespace !== COSMOS) {
       return;
@@ -144,7 +158,7 @@ const ApproveTransaction = ({ route }: ApproveTransactionProps) => {
           return;
         }
         const gasEstimation = await cosmosStargateClient!.simulate(
-          transactionMessage.value.participant!,
+          signer,
           [transactionMessage],
           MEMO,
         );
@@ -168,6 +182,7 @@ const ApproveTransaction = ({ route }: ApproveTransactionProps) => {
     requestEventId,
     topic,
     web3wallet,
+    signer,
   ]);
 
   useEffect(() => {
@@ -243,6 +258,13 @@ const ApproveTransaction = ({ route }: ApproveTransactionProps) => {
     navigation.navigate('Laconic');
   };
 
+  const replacer = (key: string, value: any): any => {
+    if (value instanceof Uint8Array) {
+      return Buffer.from(value).toString('hex');
+    }
+    return value;
+  };
+
   return (
     <>
       <ScrollView contentContainerStyle={styles.approveTransaction}>
@@ -267,7 +289,7 @@ const ApproveTransaction = ({ route }: ApproveTransactionProps) => {
         </Text>
         <View style={styles.messageBody}>
           <Text variant="bodyLarge">
-            {JSON.stringify(transactionMessage, null, 2)}
+            {JSON.stringify(transactionMessage, replacer, 2)}
           </Text>
         </View>
         <>