feat: add balancer v2 executor

foundry/lib/balancer-labs/v2-interfaces/contracts/vault/IAsset.sol

@@ -0,0 +1,26 @@
+// 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;
+
+/**
+ * @dev This is an empty interface used to represent either ERC20-conforming token contracts or ETH (using the zero
+ * address sentinel value). We're just relying on the fact that `interface` can be used to declare new address-like
+ * types.
+ *
+ * This concept is unrelated to a Pool's Asset Managers.
+ */
+interface IAsset {
+    // solhint-disable-previous-line no-empty-blocks
+}