Throw exceptions for unsupported NullableAnnotation values in public API

Throw exceptions for unsupported `NullableAnnotation` values in the public API.

For instance:
- A value type with `NullableAnnotation.Annotated`
- Any type with `Annotated` or `NotAnnotated` in VB

Applies to:
```
Compilation.CreateAnonymousTypeSymbol()
Compilation.CreateArrayTypeSymbol()
Compilation.CreateTupleTypeSymbol()
INamedTypeSymbol.Construct()
IMethodSymbol.Construct()
```