Make AsStoreRef and friends work for anything that implements Deref #3586
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Description
While updating some WAI code, I ran into a weird bug where
&mut Storedidn't implementAsEngineRefbecause we've only got animpl AsEngineRef for &Store.This PR uses the
Deref(orDerefMut, when applicable) trait to implement things likeAsStoreRef,AsStoreMut, andAsEngineReffor anything that can be dereferenced to an implementation of those traits. That means we'll have the same&Store: AsEngineRefimpl, but we'll also pick upAsEngineRefimplementations forBox<T>,Arc<T>, and so on.