Implemented missing Transform Feedback queries

Added missing implementations for binding/start/size
related queries for TransformFeedback objects.

Change-Id: Iebfebdc840764755a74d4a3753f72eceb1e6c86e
Reviewed-on: https://swiftshader-review.googlesource.com/4747
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>