Handling inputs to a smart contract constructor using nim-web3

[staheri14]

Problem

The problem is about how to deploy a smart contract with its constructor's inputs using nim-web3.

Some thoughts:
The EthSend has a data field which embodies the compiled code of the contract, probably the constructor's parameters should be passed/encoded as part of the data field, like <smartcontract code><parameters of constructor> but couldn't find the encoding procedure in the nim-web3 repo.

See this file for a sample deployment of a contract: https://github.com/status-im/nim-web3/blob/master/tests/test_utils.nim

[oskarth]

I linked issue with similar thoughts. Also upstreamed this so Nimbus team is aware of issue, since it seems like this capability should ideally be provided by nim-web3 library. status-im/nim-web3#33