feat: Add TPC-H queries (#140)

* feat: Add TPC-H queries

* fix: Address clippy lint issues

* fix: expose query helper to get query by number

Author: clflushopt

tpchgen/src/lib.rs

@@ -56,5 +56,6 @@ pub mod dates;
 pub mod decimal;
 pub mod distribution;
 pub mod generators;
+pub mod queries;
 pub mod random;
 pub mod text;