add support for sbyte, ushort, uint, ulong and nuint

[koryphaee]

I basically just copy-pasted the code for the existing types including tests. These commits look very similar to those adding short, byte etc. (8247470).

[koryphaee]

I had to introduct a new flag IsSigned to prevent the negation operator from being generated for unsigned types causing compiler errors.

[koryphaee]

I had to add some casts to the math operators because some types like short and byte do not yield their own type for math operators. short + short = int etc.

[lucasteles]

@koryphaee Looks good,

Note

I want to rethink those template styles to reduce the "copy/paste" for new types in the future

I had to introduct a new flag IsSigned to prevent the negation operator from being generated for unsigned types causing compiler errors.

The only request I have is that it would be better to merge the definitions of those bools IsNumeric and IsSigned into an Enum type:

enum NumericKind { 
  None, 
  Signed, 
  Unsigned 
}

[koryphaee]

Will do 👍

[koryphaee]

pushed the enum change