Generic TestCase and TestCaseParameter support

[stevenaw]

As a follow-up to #1215
Where we allowed the passing of Type objects in a TypeArgs property to allow consumers greater control over the type arguments used in generic test methods.

This would allow the creation of generically-typed TestCase attribute. We may want to provide a few overloads here to account for up to n different strongly typed args.

This would be on modern (NET 6+) frameworks. See a sample snippet here: #4620 (comment)

[OsirisTerje]

@stevenaw @manfred-brands Where are we with this now?

From the #4620 (comment) it looks like it works, except for .net framework, which is ok. Am I missing something here ?

[manfred-brands]

It would be a matter of adding the new attributes and tests under a conditional compilation.
@stevenaw would you like me to take this?

[stevenaw]

Feel free @manfred-brands thanks!

[stevenaw]

We might've missed a PR link here.
@manfred-brands was this one already fixed by #4755 ?

[manfred-brands]

@stevenaw Yes, indeed. I added the link.

[stevenaw]

Thanks!

[OsirisTerje]

We don't have this in the ordinary documentation, do we ?

https://docs.nunit.org/articles/nunit/writing-tests/attributes/testcase.html