feat: Do not use V4Router for uniswap v4

Do our own implementation. In the end this is much cleaner than I expected and I was able to do a few improvements:
- we don't need to use actions. using function selectors and delegate call instead
- we don't need to convert into V4 Router types
- we don't need to check balances to get the amount out, we can just use the returned value

--- don't change below this line ---
ENG-4437 Took 3 hours 56 minutes


Took 3 minutes

Took 11 minutes

foundry/src/TychoRouter.sol

@@ -786,8 +786,8 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
         returns (bytes memory)
     {
         if (data.length < 24) revert TychoRouter__InvalidDataLength();
-        _handleCallback(data);
-        return "";
+        bytes memory result = _handleCallback(data);
+        return result;
     }
 
     function _balanceOf(address token, address owner)