Add ERC2771Forwarder as an enhanced successor to MinimalForwarder (…

…OpenZeppelin#4346)

Co-authored-by: Francisco <fg@frang.io>

contracts/metatx/ERC2771Forwarder.sol

@@ -3,10 +3,10 @@
 
 pragma solidity ^0.8.19;
 
-import {ECDSA} from "../utils/cryptography/ECDSA.sol";
-import {EIP712} from "../utils/cryptography/EIP712.sol";
-import {Nonces} from "../utils/Nonces.sol";
-import {Address} from "../utils/Address.sol";
+import "../utils/cryptography/ECDSA.sol";
+import "../utils/cryptography/EIP712.sol";
+import "../utils/Nonces.sol";
+import "../utils/Address.sol";
 
 /**
  * @dev A forwarder compatible with ERC2771 contracts. See {ERC2771Context}.
@@ -20,25 +20,6 @@ import {Address} from "../utils/Address.sol";
  * * `nonce`: A unique transaction ordering identifier to avoid replayability and request invalidation.
  * * `deadline`: A timestamp after which the request is not executable anymore.
  * * `data`: Encoded `msg.data` to send with the requested call.
- *
- * Relayers are able to submit batches if they are processing a high volume of requests. With high
- * throughput, relayers may run into limitations of the chain such as limits on the number of
- * transactions in the mempool. In these cases the recommendation is to distribute the load among
- * multiple accounts.
- *
- * ==== Security Considerations
- *
- * If a relayer submits a forward request, it should be willing to pay up to 100% of the gas amount
- * specified in the request. This contract does not implement any kind of retribution for this gas,
- * and it is assumed that there is an out of band incentive for relayers to pay for execution on
- * behalf of signers. Often, the relayer is operated by a project that will consider it a user
- * acquisition cost.
- *
- * By offering to pay for gas, relayers are at risk of having that gas used by an attacker toward
- * some other purpose that is not aligned with the expected out of band incentives. If you operate a
- * relayer, consider whitelisting target contracts and function selectors. When relaying ERC-721 or
- * ERC-1155 transfers specifically, consider rejecting the use of the `data` field, since it can be
- * used to execute arbitrary code.
  */
 contract ERC2771Forwarder is EIP712, Nonces {
     using ECDSA for bytes32;