[feature request] web3.ens.resolve should take a block number

* Version: 5.18.0
* Python: 3.9
* OS: osx

### What was wrong?

I am doing some analysis of some of my old transactions and noticed that `web3.ens.resolve` was returning the current address and not the address at the time of the transaction.

### How can it be fixed?

I think adding a `block_identifier` kwarg to `web3.ens.resolve` that gets passed to the `call` functions inside would be a simple addition that would be backwards compatible.