Implement `Send` and `Sync` for `ThinBox<T>`
Just like `Box<T>`, `ThinBox<T>` owns its data on the heap, so it should implement `Send` and `Sync` when `T` does.
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Just like `Box<T>`, `ThinBox<T>` owns its data on the heap, so it should implement `Send` and `Sync` when `T` does.