feat: UniswapV3Executor and integration tests

- Note: I think we can get the fee straight from the pool... why did we always encode this and send it from the solver? Is this bound to change sometimes?

foundry/src/TychoRouter.sol

@@ -369,8 +369,8 @@ contract TychoRouter is
         int256 amount0Delta,
         int256 amount1Delta,
         bytes calldata data
-    ) internal view returns (uint256 amountOwed, address tokenOwed) {
-        address tokenIn = address(bytes20(data[0:20]));
+    ) internal view returns (uint256 amountOwed, address tokenIn) {
+        tokenIn = address(bytes20(data[0:20]));
         address tokenOut = address(bytes20(data[20:40]));
         uint24 poolFee = uint24(bytes3(data[40:43]));
 
@@ -382,6 +382,6 @@ contract TychoRouter is
         amountOwed =
             amount0Delta > 0 ? uint256(amount0Delta) : uint256(amount1Delta);
 
-        return (amountOwed, tokenOwed);
+        return (amountOwed, tokenIn);
     }
 }