Add ERC7674 (draft) (#5071)

Co-authored-by: Ernesto García <ernestognw@gmail.com>
Co-authored-by: cairo <cairoeth@protonmail.com>

contracts/mocks/BatchCaller.sol

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {Address} from "../utils/Address.sol";
+
+contract BatchCaller {
+    struct Call {
+        address target;
+        uint256 value;
+        bytes data;
+    }
+
+    function execute(Call[] calldata calls) external returns (bytes[] memory) {
+        bytes[] memory returndata = new bytes[](calls.length);
+        for (uint256 i = 0; i < calls.length; ++i) {
+            returndata[i] = Address.functionCallWithValue(calls[i].target, calls[i].data, calls[i].value);
+        }
+        return returndata;
+    }
+}

contracts/mocks/token/ERC20GetterHelper.sol

@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {IERC20} from "../../token/ERC20/IERC20.sol";
+import {IERC20Metadata} from "../../token/ERC20/extensions/IERC20Metadata.sol";
+
+contract ERC20GetterHelper {
+    event ERC20TotalSupply(IERC20 token, uint256 totalSupply);
+    event ERC20BalanceOf(IERC20 token, address account, uint256 balanceOf);
+    event ERC20Allowance(IERC20 token, address owner, address spender, uint256 allowance);
+    event ERC20Name(IERC20Metadata token, string name);
+    event ERC20Symbol(IERC20Metadata token, string symbol);
+    event ERC20Decimals(IERC20Metadata token, uint8 decimals);
+
+    function totalSupply(IERC20 token) external {
+        emit ERC20TotalSupply(token, token.totalSupply());
+    }
+
+    function balanceOf(IERC20 token, address account) external {
+        emit ERC20BalanceOf(token, account, token.balanceOf(account));
+    }
+
+    function allowance(IERC20 token, address owner, address spender) external {
+        emit ERC20Allowance(token, owner, spender, token.allowance(owner, spender));
+    }
+
+    function name(IERC20Metadata token) external {
+        emit ERC20Name(token, token.name());
+    }
+
+    function symbol(IERC20Metadata token) external {
+        emit ERC20Symbol(token, token.symbol());
+    }
+
+    function decimals(IERC20Metadata token) external {
+        emit ERC20Decimals(token, token.decimals());
+    }
+}