.NET 9 Features

1. Task.WhenEach in .NET 9
2. CountBy LINQ in .NET 9
3. AggregateBy LINQ in .NET 9
4. Index LINQ in .NET 9
5. UUID v7 in .NET9
6. SearchValues improvements in .NET9
7. Semi Auto Properties in .NET9
8. Params Collection in .NET9