Add groupBy method to Select statement

Cassandra 3.10 added support for GROUP BY clauses in SELECT statements, and yet I do not see any way to build such clauses with the QueryBuilder – one has to create the statement from hand-written string to execute such query. I’d expect QueryBuilder to allow one to add GROUP BY clauses to Select, Select.Where etc. statements similary to how ORDER BY can be added with the orderBy methods.