Push Count distinct into Druid when approximate results are acceptable

Currently queries such as

select count(distinct "dimension") from "table";

are not pushed into Druid using the cardinality aggregator because it produces an approximate result. There exists a JDBC string parameter called approximateDistinctCount introduced in CALCITE-1587 that lets the user specify whether approximate results are acceptable in count distinct queries, however this parameter is not currently utilized by the Druid adapter.