hardhat-viem full support

[CedarMist]

From readme in sapphire-viem-v2:

import hre from "hardhat";
import { sapphireLocalnet, sapphireHttpTransport } from '@oasisprotocol/sapphire-viem-v2';

const transport = sapphireHttpTransport();
const chain = sapphireLocalnet;
const publicClient = await hre.viem.getPublicClient({chain, transport});

However, need a full set of tests for hardhat-viem, as it contains many utility methods like hre.viem.deployContract, but also had a bunch of problems the last time I tested it that made it problematic to use in practice if you wanted transaction encryption.

More code example:

 const walletClient = await wrapWalletClient(createWalletClient({
      account, chain, transport
  }));
  keyedClient = {
      public: publicClient,
      wallet: walletClient
  }
  example = await hre.viem.deployContract('Example', [], {client:keyedClient});