Make next.jdbc.result-set/row-builder public

so users can use the RowBuilder objects returned by the other public functions in this namespace like as-unqualified-kebab-maps against a ResultSet object like one from a PreparedStatement as returned by next.jdbc/prepare

src/next/jdbc/result_set.clj

@@ -422,7 +422,7 @@
   (datafiable-row [this connectable opts]
     "Produce a datafiable representation of a row from a `ResultSet`."))
 
-(defn- row-builder
+(defn row-builder
   "Given a `RowBuilder` -- a row materialization strategy -- produce a fully
   materialized row from it."
   [builder]