FM-99: Ethereum API methods (Part 3)

[aakoshh]

Part of consensus-shipyard/ipc#342

This PR carries on from #119 by creating a transaction to transfer tokens between two Ethereum accounts. The only method implemented is eth_sendRawTransaction. The tests use a Wallet from the ethers library to sign transactions.

The API does not work with regular accounts, so the smoke-test setup creates two new accounts: emily and eric.

Because consensus-shipyard/ipc#336 is not implemented on the Application side yet, the PR disables signature checking for delegated addresses.

Follow up

The next PRs will continue building out new methods, as well as utilise sending raw transactions more:

• Implement signature checks by to turning the FVM message back to an ETH transaction and hashing it: FM-114: Ethereum signature check #127
• Deploy and call a smart contract.
• Implement gas estimates and local calls, now that we have the code to map transactions to FVM messages.