feat: add balancer v2 executor

foundry/lib/balancer-labs/v2-interfaces/contracts/solidity-utils/openzeppelin/IERC20PermitDAI.sol

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity >=0.7.0 <0.9.0;
+
+interface IERC20PermitDAI {
+    /**
+     * @notice update allowance with a signed permit
+     * @param holder    Token owner's address (Authorizer)
+     * @param spender   Spender's address
+     * @param nonce     The permit nonce
+     * @param expiry    The time at which this expires (unix time)
+     * @param allowed   Whether the spender is allowed or disallowed from spending
+     * @param v         v of the signature
+     * @param r         r of the signature
+     * @param s         s of the signature
+     */
+    function permit(
+        address holder,
+        address spender,
+        uint256 nonce,
+        uint256 expiry,
+        bool allowed,
+        uint8 v,
+        bytes32 r,
+        bytes32 s
+    ) external;
+}