XUnit v3 Support

[nabeelio]

Hi, great package! I'm in the process of updating to xunit v3, for the new ms test runner support, it looks like this is on 2.x only? They moved/removed the xunit.abstractions package, but I'm not sure if I'm missing something

[Arash-Sabet]

@nabeelio Your issue is unclear to me. What kind of problem are you facing exactly related to this package? Please elaborate.