Port System.Linq enhancements added in .NET 6 to System.Linq.Async

[scharnyw]

It seems that the LINQ enhancements added in .NET 6 to System.Linq have not been made available to System.Linq.Async. Some of them probably don't make much sense - e.g. TryGetNonEnumeratedCount, but others such as Chunk, the *By (DistinctBy/UnionBy/IntersectBy/ExceptBy/MinBy/MaxBy) methods and *OrDefault (FirstOrDefault/LastOrDefault/SingleOrDefault) overloads that take a default value are quite useful and I sometimes miss them when using async streams.

Could we add these enhancements to System.Linq.Async as well? If anything, it would allow the async streams to achieve feature parity with IEnumerable which I guess would be a valid argument in and by itself?