Add function to retrieve a user's ENS

[ngnathan]

The useEthereum is very helpful for easily accessing the current context of a user's wallet connection.

It would be great to have a way to retrieve the user's ENS easily as well.

Ideally:

const { ens, address, disconnect, connect, error } = useEthereum();

Then you can display a user's ens as easily as using their address.

[jsheely]

This is a good idea and would add a nice quality of life to displaying the connected wallet.

[jsheely]

Coding for this has been completed and will be pushed out in the next release