[L2] Create contract for Arbitrum reading (Part.1)

[LeonardoVieira1630]

Feature Request

We need to have an smart contract deployed on any given layer 2 protocol to be used as an external source which will be used on the redirecting phase of the L1 flow.

sequenceDiagram
  Client->>Registry :resolver("test.eth")
  Registry->>Client :0x....
  Client->>Resolver :setText("test.eth", "avatar", "avatar.png")
  Resolver->>Client :revert `StorageHandledByL2(chainId, contractAddress)`
  Client->>⭐ L2 Contract :setText("test.eth", "avatar", "avatar.png")

Describe Preferred Solution

The L2 contract should behave exactly the same way as Public Resolver would in the Layer 1.

Address reading implementation

/**
    * Returns the address associated with an ENS node.
    * @param node The ENS node to query.
    * @return The associated address.
    */
function addr(
    bytes32 node
) public view virtual override returns (address payable) {
    bytes memory a = addr(node, COIN_TYPE_ETH);
    if (a.length == 0) {
        return payable(0);
    }
    return bytesToAddress(a);
}

Checklist

• Run local node with Layer 2.

Related Code

Public Resolver contract implementation
Offchain Resolving
Address reading implementation

Additional Context

After being deployed to the given layer 2, the contract address should be stored in the layer 1 contract in order to redirect the requests by using StorageHandledByL2(chainID, contractAddress).

[pikonha]

continuation on #51