feat: add balancer v2 executor

foundry/lib/balancer-labs/v2-interfaces/contracts/solidity-utils/openzeppelin/IERC20Permit.sol

@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity >=0.7.0 <0.9.0;
+
+/**
+ * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
+ * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
+ *
+ * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
+ * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't
+ * need to send a transaction, and thus is not required to hold Ether at all.
+ */
+interface IERC20Permit {
+    /**
+     * @dev Sets `value` as the allowance of `spender` over `owner`'s tokens,
+     * given `owner`'s signed approval.
+     *
+     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
+     * ordering also apply here.
+     *
+     * Emits an {Approval} event.
+     *
+     * Requirements:
+     *
+     * - `spender` cannot be the zero address.
+     * - `deadline` must be a timestamp in the future.
+     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
+     * over the EIP712-formatted function arguments.
+     * - the signature must use ``owner``'s current nonce (see {nonces}).
+     *
+     * For more information on the signature format, see the
+     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
+     * section].
+     */
+    function permit(
+        address owner,
+        address spender,
+        uint256 value,
+        uint256 deadline,
+        uint8 v,
+        bytes32 r,
+        bytes32 s
+    ) external;
+
+    /**
+     * @dev Returns the current nonce for `owner`. This value must be
+     * included whenever a signature is generated for {permit}.
+     *
+     * Every successful call to {permit} increases ``owner``'s nonce by one. This
+     * prevents a signature from being used multiple times.
+     */
+    function nonces(address owner) external view returns (uint256);
+
+    /**
+     * @dev Returns the domain separator used in the encoding of the signature for `permit`, as defined by {EIP712}.
+     */
+    // solhint-disable-next-line func-name-mixedcase
+    function DOMAIN_SEPARATOR() external view returns (bytes32);
+}