MNS management commands

ATM, the only way to manage MNS is using the `mns.massa.net` (or it's DeWeb version). Having a CLI version could help devs to manage their MNS more easily and automate some tasks (for example, switch a domain to a "maintenance" website while updating the main website).

Having commands to resolve MNS domains, or get the list of domains targetting an address would also be really useful.

Mainly glue code to write as MNS wrapper communication is now implemented directly in Massa-web3.

Start by locating the existing CLI entry point and the MNS wrapper communication implemented in Massa-web3. Review how mns.massa.net and its DeWeb version manage domains, then define commands for domain management, resolving MNS domains, and listing domains targeting an address. Done means the CLI supports these workflows and can automate switching a domain to a maintenance website.

Written by the indexing model from the issue text.