Allow one parameter to specify members for int based enums

[SteveDunn]

Describe the feature

Taken from this feature request: SteveDunn/Vogen#562

Instances of ints should allow just one parameter to describe members; the values of which start at zero and increment, just like normal enums

[SteveDunn]

This has now been implemented on a branch and will be merged shortly.
The syntax is:

[Members("Standard, Gold, Platinum")]
public partial class CustomerType;

I tried to extend the feature to take names and values, e.g.

[Members(("Standard", 100), ("Gold", 200), ("Platinum", 300)]

... but there is a restriction on parameters in attributes as described here: dotnet/csharplang#1979

The new 'params collections' in C# 13 won't help either as it's not possible to use IEnumerable<T>