Implement write-audit-publish with clone command

[dbrtly]

I'd like to:

• add new config option "clone" as boolean with default false. If true, automatically adds suffix/prefix "audit" (with underscores) to table name
• add macro "clone_model"
• after audit tests are completed successfully (example: not_null, unique, relationship, accepted values, etc), then clone scoped models.

Clone operation via either:

• dbt run-operation clone_model(model_name) or
• dbt clone --selector my_selector (which would clone all the scoped models where cloned=true).

{% macro bigquery__clone_model(model_name) %}
{% set audit_name = “{node.name}_audit” %}
{% set clone_name = “{node.name}” %}
{% set cmd = “create or replace table {audit_name} clone clone_name” %}
{% run_query(cmd) %}
{% endmacro %}