feat: add balancer v2 executor

foundry/lib/balancer-labs/v2-interfaces/contracts/pool-utils/IPoolVersion.sol

@@ -0,0 +1,28 @@
+// 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;
+
+/**
+ * @notice Simple interface to retrieve the version of pools deployed by a pool factory.
+ */
+interface IPoolVersion {
+    /**
+     * @dev Returns a JSON representation of the deployed pool version containing name, version number and task ID.
+     *
+     * This is typically only useful in complex Pool deployment schemes, where multiple subsystems need to know about
+     * each other. Note that this value will only be updated at factory creation time.
+     */
+    function getPoolVersion() external view returns (string memory);
+}