Implement the contracts required for L2 storage and validation

[pikonha]

Feature Request

Further investigation of the ENS' EVM Gateway led to a list of contracts that need to be deployed on Ethereum to support the L2 storage and validation based on Merkle Proofs.

Describe Preferred Solution

These are the required contracts gathered from the ENS' EVM Gateway repository.

• EVMFetchTarget.sol
• EVMFetcher.sol
• EVMProofHelper.sol
• IEVMVerifier.sol
• L1Resolver.sol
• L1Verifier.sol
• MerkleTrie.sol
• SecureMerkleTrie.sol
• OffchainResolver.sol

We need a deployments directory with all the deployed contracts addresses by network,
as well as their ABI (e.g. ENS deployments) so that anyone who wants to implement the L2 Offchain reading could use it as a dependency.