feat: Add foundry environment and CI

foundry/lib/forge-std/src/interfaces/IMulticall3.sol

@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: MIT
+pragma solidity >=0.6.2 <0.9.0;
+
+pragma experimental ABIEncoderV2;
+
+interface IMulticall3 {
+    struct Call {
+        address target;
+        bytes callData;
+    }
+
+    struct Call3 {
+        address target;
+        bool allowFailure;
+        bytes callData;
+    }
+
+    struct Call3Value {
+        address target;
+        bool allowFailure;
+        uint256 value;
+        bytes callData;
+    }
+
+    struct Result {
+        bool success;
+        bytes returnData;
+    }
+
+    function aggregate(Call[] calldata calls)
+        external
+        payable
+        returns (uint256 blockNumber, bytes[] memory returnData);
+
+    function aggregate3(Call3[] calldata calls) external payable returns (Result[] memory returnData);
+
+    function aggregate3Value(Call3Value[] calldata calls) external payable returns (Result[] memory returnData);
+
+    function blockAndAggregate(Call[] calldata calls)
+        external
+        payable
+        returns (uint256 blockNumber, bytes32 blockHash, Result[] memory returnData);
+
+    function getBasefee() external view returns (uint256 basefee);
+
+    function getBlockHash(uint256 blockNumber) external view returns (bytes32 blockHash);
+
+    function getBlockNumber() external view returns (uint256 blockNumber);
+
+    function getChainId() external view returns (uint256 chainid);
+
+    function getCurrentBlockCoinbase() external view returns (address coinbase);
+
+    function getCurrentBlockDifficulty() external view returns (uint256 difficulty);
+
+    function getCurrentBlockGasLimit() external view returns (uint256 gaslimit);
+
+    function getCurrentBlockTimestamp() external view returns (uint256 timestamp);
+
+    function getEthBalance(address addr) external view returns (uint256 balance);
+
+    function getLastBlockHash() external view returns (bytes32 blockHash);
+
+    function tryAggregate(bool requireSuccess, Call[] calldata calls)
+        external
+        payable
+        returns (Result[] memory returnData);
+
+    function tryBlockAndAggregate(bool requireSuccess, Call[] calldata calls)
+        external
+        payable
+        returns (uint256 blockNumber, bytes32 blockHash, Result[] memory returnData);
+}