Clarify ref struct interface impl #44545
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Fixes dotnet#44003 Ref structs can explicitly implement an interface. However, those methods are only callable from a generic method that allows ref structs on a type parameter. Otherwise, they require a boxing conversion, which violates ref safety. Fixes dotnet#44508 Ref struct types don't need to, and in fact can't provide a specific implementation of a static method with a default implementation declared in an interface.
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Fixes #44003: Ref structs can explicitly implement an interface. However, those methods are only callable from a generic method that allows ref structs on a type parameter. Otherwise, they require a boxing conversion, which violates ref safety.
Fixes #44508: Ref struct types don't need to, and in fact can't provide a specific implementation of a static method with a default implementation declared in an interface.
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refstructure types (C# reference)