LINQ extension methods for Task<IEnumerable<T>> and ValueTask<IEnumerable<T>>.

var enumerableTask = Task.FromResult(new [] { 1, 2, 3, 4, 5});

var newEnumerable = await enumerableTask
	.Select(x => x * 2)
	.ToImmutableArrayAsync();

Available extensions:

• ToArrayAsync(), ToImmutableArrayAsync()
• ToListAsync(), ToImmutableListAsync()
• ToLookupAsync()
• ToHashSetAsync(), ToImmutableHashSetAsync()
• ToDictionaryAsync()
• Select(), SelectMany()