Viem JSON-RPC + encrypted transactions

[CedarMist]

As per the Ethers v5 & Ethers v6 standalone tests in #239

Would like to make sure Viem works and the transaction, simulate & estimate calls have encrypted calldata before we can say we officially support Viem. As we don't want people to use Sapphire + viem and think it's encrypted but it's not...

The following is a snippet of deploying the TestERC20Token contract, needs to be adapted to work with Viem.

import { http, defineChain, createWalletClient, createPublicClient, getContract } from 'viem'
import { privateKeyToAccount } from "viem/accounts";
import { TestErc20Token } from "./TestErc20Token.js";
import { assert } from 'console';

async function main () {
    const sapphireLocalnet = defineChain({
        id: 0x5afd,
        name: 'Sapphire-Localnet',
        network: 'sapphire-localnet',
        nativeCurrency: {
            decimals: 18,
            name: 'Sapphire Localnet Test',
            symbol: 'TEST'
        },
        rpcUrls: {
            default: {
                http: ['http://127.0.0.1:8545']
            },
            public: {
                http: ['http://127.0.0.1:8545']
            }
        }
    });

    const account = privateKeyToAccount('0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80');

    const walletClient = createWalletClient({
        account,
        chain: sapphireLocalnet,
        transport: http('http://127.0.0.1:8545')
    });

    const publicClient = createPublicClient({
        chain: sapphireLocalnet,
        transport: http('http://127.0.0.1:8545')
    })

    const deployHash = await walletClient.deployContract({
        abi: TestErc20Token.abi,
        account,
        bytecode: TestErc20Token.bytecode
    });
    console.log('deployHash', deployHash);
    const receipt = await publicClient.waitForTransactionReceipt({hash: deployHash});
    console.log('deployed', receipt.contractAddress!);

    const contract = getContract({
        address: receipt.contractAddress!,
        abi: TestErc20Token.abi,
        publicClient,
        walletClient: walletClient
    });

    const mintTx = await contract.write.mint([account.address, 100n]);
    console.log('mint() tx', mintTx);
    await publicClient.waitForTransactionReceipt({hash: mintTx});

    assert(await contract.read.totalSupply() == 100n);
}

await main ();

[CedarMist]

#164