Treat class field as special function (such as `type`)

In Factorio, all the API classes have a object_name field (not function!), which identifies their class name, much like type() does for base types. We're currently handling this with a plugin that rewrites this from obj.object_name to look like __object_name(obj) which is then tagged as "Lua.runtime.special": { "__object_name": "type" }, , to get it to work properly in type-tests, but it would be nice to be able to indicate that a class field "acts like type" in this way directly.

首先检查现有的 plugin rewrite：将 obj.object_name 重写为 __object_name(obj)，以及将 Lua.runtime.special 映射到 type 的过程。跟踪 type-tests 如何使用该映射，然后验证直接声明 class-field 时无需 rewrite 也能保持相同的行为。