Add TranslateDirectiveTypes automatically (via TypeInterceptor)

[gmiserez]

Currently, we have to explicitely declare all the translated types during the schema building. The Package should be able to register these types automatically, for example via a type interceptor.

           services
               .AddRouting()
               .AddGraphQLServer()
                   .AddTranslation(c => c
                       .AddTranslatableType<HairColor>() // we should not have to do this, a TypeInterceptor could possibly do this automatically
                   )