feat: (WIP) Support selection of transfer into router

- For protocols like Balancer and Curve, which expect funds to be in the router at the time of swap, we must support also transferring funds from the user into the router. Doing this in the router would mean we are dealing with transfers in two different places: in the router main methods and in the executors. To avoid this, we are now performing transfers just in the executors, and two transfer types have been added to support transfers into the router.

TODO:
- Add this for Balancer and Curve (only added for USV4 atm).
- TODO consider renaming TRANSFER_FROM and TRANSFER_PERMIT2 to include "pool" in the name

foundry/test/TychoRouterTestSetup.sol

@@ -102,7 +102,7 @@ contract TychoRouterTestSetup is Constants, Permit2TestHelper {
             new UniswapV2Executor(factoryV2, initCodeV2, PERMIT2_ADDRESS);
         usv3Executor =
             new UniswapV3Executor(factoryV3, initCodeV3, PERMIT2_ADDRESS);
-        usv4Executor = new UniswapV4Executor(poolManager);
+        usv4Executor = new UniswapV4Executor(poolManager, PERMIT2_ADDRESS);
         pancakev3Executor = new UniswapV3Executor(
             factoryPancakeV3, initCodePancakeV3, PERMIT2_ADDRESS
         );
@@ -178,15 +178,11 @@ contract TychoRouterTestSetup is Constants, Permit2TestHelper {
         address tokenIn,
         address target,
         address receiver,
-        bool zero2one
+        bool zero2one,
+        TokenTransfer.TransferType transferType
     ) internal pure returns (bytes memory) {
-        return abi.encodePacked(
-            tokenIn,
-            target,
-            receiver,
-            zero2one,
-            TokenTransfer.TransferType.TRANSFER
-        );
+        return
+            abi.encodePacked(tokenIn, target, receiver, zero2one, transferType);
     }
 
     function encodeUniswapV3Swap(
@@ -194,7 +190,8 @@ contract TychoRouterTestSetup is Constants, Permit2TestHelper {
         address tokenOut,
         address receiver,
         address target,
-        bool zero2one
+        bool zero2one,
+        TokenTransfer.TransferType transferType
     ) internal view returns (bytes memory) {
         IUniswapV3Pool pool = IUniswapV3Pool(target);
         return abi.encodePacked(
@@ -204,7 +201,7 @@ contract TychoRouterTestSetup is Constants, Permit2TestHelper {
             receiver,
             target,
             zero2one,
-            TokenTransfer.TransferType.TRANSFER
+            transferType
         );
     }
 }