Package registry PoC

[facuspagnuolo]

We want to explore an implementation of an on-chain package registry, i.e. a contract that lists packages and allows users to access them using a human-readable name. By "packages" we understand zOS Packages, but it could be used to list any kind of package contract, or simply, any smart contract.

We are considering supporting the ENS standard to provide an implementation that could fit for many other projects.