[FEATURE] Create a Engagement data source using the DTB project.

[thebelrobot]

Is your feature request related to a problem? Please describe.
We need to set up the DBT project for the webhook service which will be responsible for transforming the data stored at the BigQuery level. Then we wanted to create an Engagement data source.

Describe the solution you'd like

• [Engagement Data source] Setup DBT project on local machine.  #33
• [Engagement Data Source] Create the Data Models Diagram #35
• Get confirmation from the product team - 2 pointers - expecting a few rounds of discussions
• Transform the data using the DBT setup - 3 - 5 pointers
• Test and validate the transformed data - 2 pointers

Describe alternatives you've considered
NA

Additional context
NA

Acceptance Criteria

• The engagement data source should be ready to use by the product team for analytics.

Documentation
Add whatever documentation will be required here.