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/TychoRouterSplitSwap.t.sol

@@ -143,6 +143,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             false,
             4,
             ALICE,
+            true,
             pleEncode(swaps)
         );
 
@@ -171,6 +172,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             false,
             4,
             ALICE,
+            true,
             pleEncode(swaps)
         );
         vm.stopPrank();
@@ -196,6 +198,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             false,
             2,
             ALICE,
+            true,
             pleEncode(swaps)
         );
 
@@ -482,6 +485,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             false,
             2,
             ALICE,
+            true,
             pleEncode(swaps)
         );
         vm.stopPrank();