Support for ENS wildcard and offchain resolution

[makoto]

Explanation

This PR addresses MetaMask/specifications#9

NOTE: Support for contenthash will be separate PR.

More information

Please read https://medium.com/the-ethereum-name-service/upgrade-ethers-js-to-5-6-1-to-activate-ens-l2-offchain-integration-40ee1a0fdf2a for more deail.

Screenshots/Screencaps

Display forward lookup

Display reverse record (aka primary name)

Manual testing steps

• 1. Select testnet (Ropsten/Rinkeby/Goerli network)
• 2. Lookup 1.offchainexample.eth to lookup ENS name
• 3. Send ETH to 1.offchainexample.eth and check it shows in the transaction log

[github-actions]

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1 out of 2 committers have signed the CLA.
✅ @makoto
❌ @makoto Inoue

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[makoto]

I have read the CLA Document and I hereby sign the CLA

[jacobc-eth]

Hey Makoto, we're discussing this on our side! In the meantime, would you consider submitting a similar PR for MetaMask Mobile? We try to avoid situations where features are only available on one client to the extent possible.

[makoto]

would you consider submitting a similar PR for MetaMask Mobile?

I can give it a try but do your mobile apps also use js so that I can just upgrade ethers.js that does the majority of the support work?

[jacobc-eth]

@makoto yep, our mobile app is React Native.

[brad-decker]

Closing in favor of #14675