test: add GasTest to compare with Universal Router gas usage

foundry/interfaces/IUniversalRouter.sol

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+pragma solidity ^0.8.24;
+
+interface IUniversalRouter {
+    /// @notice Thrown when a required command has failed
+    error ExecutionFailed(uint256 commandIndex, bytes message);
+
+    /// @notice Thrown when attempting to send ETH directly to the contract
+    error ETHNotAccepted();
+
+    /// @notice Thrown when executing commands with an expired deadline
+    error TransactionDeadlinePassed();
+
+    /// @notice Thrown when attempting to execute commands and an incorrect number of inputs are provided
+    error LengthMismatch();
+
+    // @notice Thrown when an address that isn't WETH tries to send ETH to the router without calldata
+    error InvalidEthSender();
+
+    /// @notice Executes encoded commands along with provided inputs. Reverts if deadline has expired.
+    /// @param commands A set of concatenated commands, each 1 byte in length
+    /// @param inputs An array of byte strings containing abi encoded inputs for each command
+    /// @param deadline The deadline by which the transaction must be executed
+    function execute(bytes calldata commands, bytes[] calldata inputs, uint256 deadline) external payable;
+}