New config option: Ignore priorities data

[SteadyGiant]

See here.

What change(s) does this PR introduce?

Allow user to ignore Priority data. See PR submitted to fivetran/dbt_jira, linked above.

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.)

The package still includes Priority data by default.

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)

• [x] Yes

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

• [ ] Yes, Issue/Feature [link bug/feature number here]
• [x] No

See PR submitted to fivetran/dbt_jira, linked above.

How did you test the PR changes?

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

Ran on my local Windows machine against Redshift.

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

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

[SteadyGiant]

Updated changelog. Added myself as a contributor.