general query builder (type-state)

implemented for select & insert for now. update & delete planned

src/prelude.rs

@@ -1,12 +1,6 @@
 pub use google_bigquery_v2_derive::BigDataTableDerive;
 
 pub use crate::client::BigqueryClient;
-pub use crate::data::{bigquery_builder::{
-    BigQueryBuilder,
-    BigQueryBuilderAvailable,
-    OrderDirection,
-},
-                      BigQueryTable,
-                      BigQueryTableBase};
+pub use crate::data::{BigQueryTable, BigQueryTableBase, OrderDirection};
 
 pub type Result<T> = std::result::Result<T, Box<dyn std::error::Error + Send + Sync>>;