Port hardhat-ethers to the v3 API

[kanej]

Port the hardhat-ethers Hardhat plugin to ESM and the Hardhat v3 API.

The interactions with the network API will have to be updated and consideration given to how ethers interacts with the default network.

The pattern used in the network helpers is likely to inform the ethers api, e.g.

const { ethers } = await hre.network.connect();

const lock = await ethers.deployContract("Lock", [unlockTime], {
  value: lockedAmount,
});

• Design doc
• new hardhat-ethers package