Add dbt version check and adapt dbt test module for upcoming deprecation

[itismichael]

Summary

This pull request adds a feature to check the installed dbt version and adapt test definitions accordingly. Specifically, it prepares for the announced deprecation where dbt will use data_tests: instead of tests: for test definitions in configuration files.

Changes

• Added a dbt_version_util.py module with a function is_version_gte_1_8 to check the dbt version.
• Modified dbt_test_module.py to use the new version check function and adapt test definitions based on the installed dbt version.

Motivation

See Issue #79 for details.

Testing

Tested locally with dbt versions to ensure correct behavior:

• When running with dbt 1.7.x, droughty_schema.yml uses "tests:"
• When running with dbt 1.8.1, droughty_schema.yml uses "data_tests:"

Related Issues

Closes #79