Hardhat Node doesn't handle estimateGas calls with a low base fee

[fvictorio]

If you start a Hardhat node and send an eth_estimateGas whose gas price (or max fee per gas) is lower than the current base fee, you get an ugly "If you think this is a bug in Hardhat, please report it here" error.

This happens often when interacting with a contract in the node using MetaMask. I guess MetaMask assumes local networks have a base fee of 0.

A workaround is to set initialBaseFeePerGas to zero:

module.exports = {
  solidity: "0.8.17",
  networks: {
    hardhat: {
      initialBaseFeePerGas: 0
    },
  },
};

But we should show a proper error in these cases.

Alternatively, maybe we should just accept estimateGas calls that don't have a gas price above the base fee. See #2469