Support for Tuples

[adrianoc]

https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/value-tuples

• [ ] #296
• [ ] ValueTuple<T>
• [ ] Tuple<T> ?
• [ ] Specify field names

[adrianoc]

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/value-tuples