Add a set of wrapper ITypeSymbols that carry nullability along
Currently, the APIs for nullable reference types take a model that instead of the top level nullability of a named type being on the INamedTypeSymbol, it's carried along as a separate piece of information. This causes a lot of churn for code that is used to passing along ITypeSymbols today; one way to ease this is simply create a set of wrapper types which carry it along for us but still implement ITypeSymbol.
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