Enrich Java API to allow requesting :query-stats by Peer.query

Hi @jaret , datomic.QueryRequest from jar com.datomic:peer:1.0.7025 does not provide a way to request query-stats. Is it planned to add such feature in the next releases?

P.S. Additionally I noticed no information on datomic.api - Datomic Clojure API documentation about :query-stats too

I see that Java library for 1.7180 does not support yet this great feature, it is very sad that improving Java API is ignored