feat: offchain validate name owner

[wa0x6e]

Toward https://github.com/snapshot-labs/workflow/issues/485

This PR adds support for checking a domain owner offchain, using the domain DNS records for top level donain (
https://docs.ens.domains/registry/dns#offchain-verification-gasless), and resolved address for subdomain

For offchain subdomains, it will return the resolved address as owner, since offchain subdomain do not have the concept of owner/controller

Also edit the function signature to always return an address, to be combatible with sx

Test

const owner = await snapshot.utils.getEnsOwner(DOMAIN);

• It should return results as before for regular .eth domains
• It should return results for regular domains, using the dns txt records to prove ownership (like defi.app)
• It should return results for subdomain, such as lucemans.cb.id

Those offchain subdomains should resolved to these addresses

{
    "defi.app": "0x7aeB96261e9dC2C9f01BaE6A516Df80a5a98c7eB",
    "lucemans.cb.id": "0x4e7abb71BEe38011c54c30D0130c0c71Da09222b",
    "lucemans.uni.eth": "0x225f137127d9067788314bc7fcc1f36746a3c3B5",
    "ulas.clv.eth": "0xd883E2d407361049dd3DACE2fF4278D75BC11d2A"
  }

[wa0x6e]

Code has been updated to also support offchain subdomains

[ChaituVR]

Is there some other way than hardcoding sepolia? this testnet can change time to time

[ChaituVR]

Maybe we can just ignore all unsupported operations irrespective of the network?

[ChaituVR]

Everything else is working well

[ChaituVR]

tAck