MB-43329 improve Count() and Size()
MB-43329 improve Count() and Size()

Change-Id: Ic4edced6951a3e10913fdfe6c5394eb621b13cfe
Reviewed-on: http://review.couchbase.org/c/go-couchbase/+/142271
Reviewed-by: Sitaram Vemulapalli <8d86a491dcdf321bac78bef141a8229a59bf9211@couchbase.com>
Tested-by: Marco Greco <63a03f5b14a94e811cf577897911ec77986e074a@couchbase.com>

couchbase/go-couchbase