Hooks-chaining alpha

This is a squash of 241 commits from https://github.com/XRPL-Labs/xrpld-hooks/tree/hooks-chaining
Ready for forward porting to rippled 1.8.3

src/ripple/protocol/impl/STObject.cpp

@@ -186,7 +186,10 @@ STObject::set(SerialIter& sit, int depth) noexcept(false)
         {
             JLOG(debugLog().error()) << "Unknown field: field_type=" << type
                                      << ", field_name=" << field;
-            Throw<std::runtime_error>("Unknown field");
+            std::stringstream ss;
+            ss << "Unknown field in Object t=" << type << " f=" << field;
+
+            Throw<std::runtime_error>(ss.str().c_str());
         }
 
         // Unflatten the field