feat: Refactor Curve Executor not to use the router

We don't need to use all the functionalities of the Curve Router, only the swap type 1 (exchange). By bypassing the router we can save gas on 2 token transfers and with smaller calldata
A nice side effect is that the executor is much more readable and understandable now

--- don't change below this line ---
ENG-4305 Took 2 hours 25 minutes


Took 12 seconds

foundry/interfaces/ICurveRouter.sol

@@ -1,27 +0,0 @@
-// SPDX-License-Identifier: BUSL-1.1
-pragma solidity ^0.8.26;
-
-/**
- * @title Curve Router Interface
- * @notice Interface for interacting with Curve's router contract for token swaps across various Curve pools
- * @dev This interface allows for executing swaps through Curve's router, which can handle different pool types
- */
-interface ICurveRouter {
-    /**
-     * @notice Executes a token swap through Curve pools
-     * @dev This function handles the routing of tokens through one or more Curve pools
-     * @dev The parameters are encoded in the `CurveRouterParams` struct
-     * @return Amount of output tokens received from the swap
-     */
-    function exchange(
-        address[11] memory route,
-        uint256[5][5] memory swapParams,
-        uint256 amountIn,
-        uint256 minAmountOut,
-        address[5] memory pools,
-        address receiver
-    ) external payable returns (uint256);
-}
-
- 
-