Update MNS w/ enumerable extension

[Thykof]

Objective
Stop using the cache will greatly improve user experience, pain points:

• after allocation a domain, user can't see it immediately
• after change the owner of a domain, use still see it but can't do anything
• after changing the target, use still see the previous target.

How to

• implement NFT enumerable extension Implement ERC721 enumerable extension massa-standards#148
• update the smart contract with the NFT enumerable extension
• clean the smart contract code by removing all NFT functions: we must export them instead of copy-paste
• upgrade the smart contract: call upgradeSC
• update the frontend: don't use the cache of the explorer: the extension allows to get all NFT ids owned by the connected address. With that, we can use getDomainFromTokenId to get the list of owned domain and display them.
• Migrate all registered / existing MNS in the new index
• Test updated MNS system on labnet & buildnet

[damip]

• create the enumerable extension
• migrate the MNS SC to work with it (index the existing registered MNS names)
• drop the need for the cache in:
  • the MNS front-end which allows it to become fully decentralized (including the deweb-hosted version)
  • the explorer / indexer

[SlnPons]

This ticket is blocked by massalabs/massa-standards#148