Document CCIP-read / 'Durin' support

[tfalencar]

Suggestion

I noticed that a very useful feature (EIP-3668, also known as CCIP-read or formerly "Durin") has been implemented in ethers.js: #2478, but there is no mention about in the documentation.

I think many parts can be simply copied from this great article: https://blog.ricmoo.com/highlights-ethers-js-march-2022-f511fe1e88a1

Suggestions:

• Is the feature disabled or enabled by default? If disabled, how to enable it (and vice-versa)?
• Is it possible to use only the "EIP-3668" part without the ENS resolution part (EIP-2544) ?
• Mention which interfaces the smart contract side needs to implement to be compatible (perhaps simply reference the EIP-3668 link).

[tfalencar]

@ricmoo is the correct way to turn on ccip-read, like below?

const tx = await erc20.transfer(RECIPIENT, amount, { ccipReadEnabled: true });

[tfalencar]

Looks like I figured out how to use the feature. I've replaced chainlink's provider wrapper with ethers, and it seems to work - let me know if I'm missing anything, but it appears to work: smartcontractkit/ccip-read#28