`decl_runtime_apis!` - check that a method without `changed_in` exists (#5635)

* `decl_runtime_apis!` - check that a method without `changed_in` exists

This adds another check to the macro that ensures that not only methods
with `changed_in` exists, but there are also the default methods exist.

* Update primitives/api/proc-macro/src/decl_runtime_apis.rs

Co-Authored-By: Nikolay Volf <nikvolf@gmail.com>

* Fix test

Co-authored-by: Nikolay Volf <nikvolf@gmail.com>