Add ERC7739 and ERC7739Utils (#5664)

contracts/mocks/utils/cryptography/ERC7739Mock.sol

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.20;
+
+import {ECDSA} from "../../../utils/cryptography/ECDSA.sol";
+import {EIP712} from "../../../utils/cryptography/EIP712.sol";
+import {ERC7739} from "../../../utils/cryptography/ERC7739.sol";
+import {AbstractSigner} from "../../../utils/cryptography/AbstractSigner.sol";
+
+contract ERC7739ECDSAMock is AbstractSigner, ERC7739 {
+    address private _signer;
+
+    constructor(address signerAddr) EIP712("ERC7739ECDSA", "1") {
+        _signer = signerAddr;
+    }
+
+    function signer() public view virtual returns (address) {
+        return _signer;
+    }
+
+    function _rawSignatureValidation(
+        bytes32 hash,
+        bytes calldata signature
+    ) internal view virtual override returns (bool) {
+        (address recovered, ECDSA.RecoverError err, ) = ECDSA.tryRecover(hash, signature);
+        return signer() == recovered && err == ECDSA.RecoverError.NoError;
+    }
+}