Support value variables for paging params (offset, after, first)

Issues Dgraph
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3

MichelDiz commented :

I think this feature could be very handy e.g:

{
#dummy query as empty query you can't use, other than aggregation.
  var(func: uid(0x1)){  
    amount as math(5)
    page   as math(2)
    OST as math(amount * page)
  }
  q(func: has(somePred), 
    orderasc: otherPred, first: val(amount), offset: val(OST) ) {
    expand(_all_)
  }
}