Guide and Example on adding dbt Models to Airflow in a DAG

Provides an example set of dbt models, and a corresponding Airflow DAG as well as a guide on how to write a DAG for dbt models

Closes D3B-2152 and D3B-2194

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality
  to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

By running the dbt models within airflow

Checklist

Please check all of the items below before merging this pull request. If an
item in the list below does not need to be completed, please indicate the
reason why.

• I ensured that all tables have proper source and ref definitions
• I Defined {{ config(schema=[schema name], tags = [list, of, tags]) }} at
  the start of each script
• I have performed a self-review of my own code
• I have checked my code and corrected any misspellings
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature
  works
• My code follows the style guidelines of this project
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes
• I have committed any related changes to the PR
• Run sqlfluff fix on tables that are created or modified in this PR.