v0.3.0 dbt_apple_search_ads

PR #20 includes the following updates:

Feature update 🎉

• Unioning capability! This adds the ability to union source data from multiple apple_search_ads connectors. Refer to the Union Multiple Connectors README section for more details.

Under the hood 🚘

• In the source package, updated tmp models to union source data using the fivetran_utils.union_data macro.
• To distinguish which source each field comes from, added source_relation column in each staging and downstream model and applied the fivetran_utils.source_relation macro.
  • The source_relation column is included in all joins in the transform package.
• Updated tests to account for the new source_relation column.

Full Changelog: v0.2.2...v0.3.0