Add support for XLS-81 Permissioned DEX (#5404)

Modified transactions:
- OfferCreate
- Payment

Modified RPCs:
- book_changes
- subscribe
- book_offers
- ripple_path_find
- path_find

Spec: https://github.com/XRPLF/XRPL-Standards/pull/281

src/test/app/Discrepancy_test.cpp

@@ -147,7 +147,8 @@ public:
     {
         using namespace test::jtx;
         auto const sa = supported_amendments();
-        testXRPDiscrepancy(sa - featureFlowCross);
+        testXRPDiscrepancy(sa - featureFlowCross - featurePermissionedDEX);
+        testXRPDiscrepancy(sa - featurePermissionedDEX);
         testXRPDiscrepancy(sa);
     }
 };