Deserialize expanded properties automatically or with $expand

[joshgav]

For $expand, ensure we properly deserialize and associate the expanded properties in the response.

Is there an efficient way to always deserialize expanded properties whenever we encounter them in a response? That is, not be tied necessarily to $expand, but simply expand whenever we find expanded props in the payload. For example, if an API owner decides that the default should be to return some things expanded by default.

[joshgav]

In addition, we should include navigation properties in the generated classes.

• If $expand is called these would include the expanded items.
• If $expand isn't called
  • for navigation properties that refer to single instances, the instance should have a value of null
  • for those that refer to collections, they should have a value of an empty collection.