Build list of what possible handles need to be wrapped/unwrapped from a given function call

We have had many issues in the past not detecting the Unwrap/Wrapping correctly.

It would be good to add some thing that would use the codegen logic to detect where the handles are and give warning when we forgot one

The most common case for this are the things in `dispatch_object_manual.cpp`, a new extension comes out that adds a pNext chain somewhere in one of those structs, and it doesn't get added until someone finally writes a tests for it

Start by reading the codegen logic and the handle-wrapping paths in dispatch_object_manual.cpp to understand how pNext chains and related structs are currently handled. Done means producing warnings that identify handles requiring wrapping or unwrapping when a new case is missed, with coverage for the relevant dispatch paths.

Written by the indexing model from the issue text.