Imported Resources don't provide a finalizer

Currently, projections for imported resources implement `IDisposable`, but they do not provide a `finalizer`. This means that if the user forgets to manually dispose the resource, its `[resource-drop]` function is never called.

I believe this is incorrect, and the resource should provide a finalizer that calls the resource's `[resource-drop]` function.

---

Version:
````xml

````

首先定位为导入资源生成的 projection，以及 issue 中描述的 IDisposable 实现。跟踪资源的 [resource-drop] 函数是如何处理的，然后验证未释放的 projection 会通过 finalizer 调用它；issue 未提供文件或测试入口点。

由索引模型根据 Issue 内容生成。