[FEAT] ENS multi-chain support

[aelmanaa]

Description Chainlink has data feeds in several EVM-compatible chains(Ethereum, BNB, Matic..Etc). However the resolver is only configured for mainnet and hence, ENS cannot be used for other chains. The lookup here works only for mainnet.

Motivation Make developer experience better on other EVM-compatible chains by allowing them to use ENS to lookup the data feeds.

Additional Information While reading blogs from the ENS team, I understand that their recommendations are to :

• only use mainnet for resolution: Our recommendation is simple: always refer to the ENS name on Ethereum mainnet (networkId 1). source
• set one address for each side chain when registering the ENS records. there is a field called Coin Type source

[PatrickAlphaC]

Thanks for the suggestion! Added as enhancement, it's likely lower priority at the moment.

[PatrickAlphaC]

Tracking: https://app.shortcut.com/chainlinklabs/story/34576/feat-ens-multi-chain-support