feat: allow executor to do native swaps, add diff pool type tests

Took 4 seconds

foundry/src/executors/CurveExecutor.sol

@@ -9,26 +9,41 @@ contract CurveExecutor is IExecutor {
     using SafeERC20 for IERC20;
 
     ICurveRouter public immutable curveRouter;
+    address public immutable ethAddress;
 
-    constructor(address _curveRouter) {
+    constructor(address _curveRouter, address _ethAddress) {
         curveRouter = ICurveRouter(_curveRouter);
+        ethAddress = _ethAddress;
     }
 
+    // slither-disable-next-line locked-ether
     function swap(uint256 amountIn, bytes calldata data)
         external
         payable
         returns (uint256)
     {
         CurveRouterParams memory params = _decodeData(data);
-        IERC20(params.route[0]).approve(address(curveRouter), amountIn);
-        return curveRouter.exchange(
+        if (params.route[0] != ethAddress) {
+            IERC20(params.route[0]).approve(address(curveRouter), amountIn);
+
+            return curveRouter.exchange(
             params.route,
             params.swapParams,
             amountIn,
             params.minAmountOut,
             params.pools,
             params.receiver
-        );
+            );
+        } else {
+            return curveRouter.exchange{value: amountIn}(
+                params.route,
+                params.swapParams,
+                amountIn,
+                params.minAmountOut,
+                params.pools,
+                params.receiver
+            );
+        }
     }
 
     function _decodeData(bytes calldata data)
@@ -38,4 +53,6 @@ contract CurveExecutor is IExecutor {
     {
         return abi.decode(data, (CurveRouterParams));
     }
+
+    receive() external payable {}
 }