dbt-oracle v1.5.0

[aosingh]

Addresses #83

1. Model Contracts

   • Implement data_type_code_to_name to convert Python connector return types to strings

   • Implement oracle__get_empty_subquery_sql and oracle__get_empty_schema_sql to generate SQL to assert column spec equivalence

   • Updated macro create_table_as add calls to two macros that assert column spec equivalence and template out DDL containing column names, types, and constraints

   • Updated macro create_view_as add a call to the macro asserting column spec equivalence

   • Support the constraints data structure

     • Map constraint types to CONSTRAINT_SUPPORT
     • Override Adapter method render_column_constraint

2. Dependencies dbt-core and oracledb upgraded

3. Lots of new test cases