Add support for querying

[kzu]

There is fairly capable querying capability for the table storage service. We should provide something similar (mostly identical?) to the LINQ support to be competitive, while still preserving the POCO-ness of our abstractions.

The goal is to support the following syntax:

await foreach (var info in from book in repo.CreateQuery()
                           where book.Author == "Rick Riordan" && book.Format == "Hardback" && book.IsPublished
                           select new { book.ISBN, book.Title })
{
  Console.WriteLine($"Found {info.Title} by Rick Riordan (ISBN: {info.ISBN}).");
}