chore: Rename all SwapExecutor to Executor only for simplicity

--- don't change below this line ---
ENG-4033 Took 9 minutes

foundry/interfaces/IExecutor.sol

@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.28;
+
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+
+pragma abicoder v2;
+
+interface IExecutor {
+    /**
+     * @notice Performs a swap on a liquidity pool.
+     * @dev This method takes the amount of the input token and returns the amount of
+     * the output token which has been swapped.
+     *
+     * Note Part of the informal interface is that the executor supports sending the received
+     *  tokens to a receiver address. If the underlying smart contract does not provide this
+     *  functionality consider adding an additional transfer in the implementation.
+     *
+     * @param givenAmount The amount of the input token to swap.
+     * @param data Data that holds information necessary to perform the swap.
+     * @return calculatedAmount The amount of the output token swapped, depending on
+     * the givenAmount inputted.
+     */
+    function swap(uint256 givenAmount, bytes calldata data)
+        external
+        returns (uint256 calculatedAmount);
+}
+
+interface IExecutorErrors {
+    error InvalidParameterLength(uint256);
+    error UnknownPoolType(uint8);
+}