Add MySql, BigQuery to all dialects (#697)

* Add MySql, BigQuery to all dialects

* move unsupported on mysql from common

src/test_utils.rs

@@ -142,6 +142,8 @@ pub fn all_dialects() -> TestedDialects {
             Box::new(SnowflakeDialect {}),
             Box::new(HiveDialect {}),
             Box::new(RedshiftSqlDialect {}),
+            Box::new(MySqlDialect {}),
+            Box::new(BigQueryDialect {}),
         ],
     }
 }