fix: ENS CCIP Read improvements

[Syn-McJ]

What does this PR do?

The current implementation of ERC-3668: CCIP Read for ENS name resolution is too strict and doesn't follow the standard exactly.

• Currently, the {sender} parameter is enforced in URL while the standard specifies that it can be sent in POST as part of DTO.
• Currently, the callback request is always made to the hard-coded resolveWithProof method while the standard specifies that the callbackFunction from OffchainLookup should be used.
• Data in the isEIP3668 method might have double quotes that must be stripped.

Where should the reviewer start?

The ERC-3668: https://eips.ethereum.org/EIPS/eip-3668#abstract

Why is it needed?

These problems prevent L2 subdomains created with Durin from being resolved, as well as others like base.eth subdomains.

Checklist

• I've read the contribution guidelines.
• I've added tests (if applicable).
• I've added a changelog entry if necessary.