feat: Add transferFromNeeded to non permit2 methods

This will block an attempt to transfer from the user when we expect the funds to already be in the router.

chores:
- add docs
- in EncodingContext, rename transfer to transfer_type

Took 58 minutes

foundry/test/TychoRouterSequentialSwap.t.sol

@@ -87,6 +87,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
             false,
             false,
             ALICE,
+            true,
             pleEncode(swaps)
         );
 
@@ -113,6 +114,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
             false,
             false,
             ALICE,
+            true,
             pleEncode(swaps)
         );
     }
@@ -135,6 +137,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
             false,
             false,
             ALICE,
+            true,
             pleEncode(swaps)
         );
     }