Feature/revamp/email based customers

[fivetran-jamie]

Are you a current Fivetran customer?

fivetran made PR

What change(s) does this PR introduce?

adds new end models for customers that are rolled up to the EMAIL instead of customer_id

it does NOT include full documentation. this will be completed in a later PR

Did you update the CHANGELOG?

• [x] Yes

Does this PR introduce a breaking change?

• [ ] Yes (please provide breaking change details below.)
• [x] No (please provide an explanation as to how the change is non-breaking below.) additional models

Did you update the dbt_project.yml files with the version upgrade (please leverage standard semantic versioning)? (In both your main project and integration_tests)

• [ ] Yes

Is this PR in response to a previously created Bug or Feature Request

• [x] Yes, Issue/Feature https://github.com/fivetran/dbt_shopify/issues/37
• [ ] No

How did you test the PR changes?

• [ ] Buildkite
• [x] Local (please provide additional testing details below)

Select which warehouse(s) were used to test the PR

• [x] BigQuery
• [x] Redshift
• [x] Snowflake
• [x] Postgres
• [x] Databricks
• [ ] Other (provide details below)

Provide an emoji that best describes your current mood

🌧️ **Feedback** We are so excited you decided to contribute to the Fivetran community dbt package! We continue to work to improve the packages and would greatly appreciate your [feedback](https://www.surveymonkey.com/r/DQ7K7WW) on our existing dbt packages or what you'd like to see next.

[fivetran-jamie]

buildkite may not pass on other models because i have not yet propagated source-package-renames and -deprecations to the transform models