Remove unused account in eth_estimateGas

[guillemsole]

Good afternoon team, I'm using your library to build an app with web3. Thank you for your work, it has been really helpful. I would like to propose a small improvement.

While building my model I have found that EthereumClient function eth_estimateGas does not use the account parameter and would be good to remove it.

I have a model Token where I inject contract address and EthereumClient for the read functions. For the write functions I want the model to return a transaction with GasPrice and GasLimit calculated. Having the account as a parameter of eth_estimateGas, forces me to inject the account which is not used and is coupled to it.

I have maintained signature of the deprecated method.

[dioKaratzas]

LGTM! @DarthMike should deprecate those functions instead of removing them?

[DarthMike]

Thanks @guillemsole