Design FNS Domain Name System

Users can register their domain names in the FNS system and map them to the address of IPFS storage space.

The FNS domain name system needs to provide basic functions such as domain name registration, inquiry, and management, while ensuring the decentralization and security of the system.

The FNS domain name system needs to be integrated with the Filecoin network so that users can use FIL tokens to purchase and manage domain names.