Add getcontractcreation binding

[klkvr]

This PR adds binding for getcontractcreation method which returns contract deployer and creation tx.

I will need this to complete #6344 foundry issue.

I have only added binding and support for fetching data for single contract but Etherscan supports fetching those for up to 5 contracts at a time. Considering such small restriction, does it make sense to implement binding for multi-contract requests too?

[Evalir]

looks great, just smol nits re: docs. tests look good

I think it's fine to only have bindings for 1 contract at a time. We can always add multi contract binds later

[Evalir]

thank u sir