Resolve addresses to an ENS record (including subnames)

When an address is able to resolve to an ENS name, it does so in all related fields with a contract or wallet address.

1. An operator contract resolves to its name.
2. A payee's wallet resolves to its ENS name if it exists.
3. The payor's wallet also resolves to an ENS name if it exists.

What is the benefit to the user? It can make it easier and more human-readable to know who is the operator of the contracts for services they are using, and who is the payee, the recipient of their funds, as well as to be able to find their own contract address.

What is the benefit to the business? It makes it easier for us to be able to identify who is paying, what contracts are available, who are the operators.

Open space: we do have `filpay.eth` and name space is proposing a way to register and charge customers for registering their own subname; not recommending we do this but putting this in case it impacts design considerations.