feat: add balancer v2 executor

foundry/lib/balancer-labs/v2-interfaces/contracts/liquidity-mining/IVotingEscrow.sol

@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+pragma solidity >=0.7.0 <0.9.0;
+pragma experimental ABIEncoderV2;
+
+import "./IAuthorizerAdaptor.sol";
+
+// For compatibility, we're keeping the same function names as in the original Curve code, including the mixed-case
+// naming convention.
+// solhint-disable func-name-mixedcase
+
+interface IVotingEscrow {
+    struct Point {
+        int128 bias;
+        int128 slope; // - dweight / dt
+        uint256 ts;
+        uint256 blk; // block
+    }
+
+    function epoch() external view returns (uint256);
+
+    function totalSupply(uint256 timestamp) external view returns (uint256);
+
+    function user_point_epoch(address user) external view returns (uint256);
+
+    function point_history(uint256 timestamp) external view returns (Point memory);
+
+    function user_point_history(address user, uint256 timestamp) external view returns (Point memory);
+
+    function checkpoint() external;
+
+    function admin() external view returns (IAuthorizerAdaptor);
+
+    function smart_wallet_checker() external view returns (address);
+
+    function commit_smart_wallet_checker(address newSmartWalletChecker) external;
+
+    function apply_smart_wallet_checker() external;
+}