Include DBT DRY RUN as a utilities plugin (#1164)

Co-authored-by: Pat Nadolny <patnadolny@gmail.com>

_data/default_variants.yml

@@ -599,3 +599,4 @@ utilities:
   postgres: postgres
   sqlfluff: sqlfluff
   superset: meltano
+  dbt-dry-run: autotraderuk

_data/meltano/utilities/dbt-dry-run/autotraderuk.yml

@@ -0,0 +1,57 @@
+definition: |
+  dbt-dry-run is a meltano plugin based on the awesome tool created by the team at AutoTraderUk.
+  It allows dbt-bigquery users to validate if their models will run (without encuring costs).
+  It leverages bigquery's [dry-run](https://cloud.google.com/bigquery/docs/dry-run-queries) feature.
+
+  **A note**
+  This plugin is at it's most powerful (in our opinion) in CI (we use github actions). It allows us to ensure that our changes will not break production.
+domain_url: https://github.com/autotraderuk/dbt-dry-run
+executable: dbt-dry-run
+keywords:
+- dbt
+- bigquery
+- testing
+- continuous-integrations
+- meltano_edk
+label: dbt-dry-run (BigQuery Only)
+logo_url: /assets/logos/utilities/dbt-dry-run.png
+maintenance_status: active
+name: dbt-dry-run
+namespace: dbt-dry-run
+next_steps: |
+  To run this plugin for the first time, simply specify you DBT_BIGQUERY_PROFILES_DIR, DBT_BIGQUERY_PROJECT_DIR and DBT_DRY_RUN_TARGET.
+  You will also need to compile your dbt models using the command `dbt-bigquery compile`.
+
+  To run your plugin, you will need to define a target as well. We propose to easily to this by creating this custom command:
+  ```
+  commands:
+  run:
+    args:
+      --target ${DBT_DRY_RUN_TARGET}
+      --verbose
+    definition: |
+      Allows you to run the plugin. Requires that you specify a profile target.
+      Note - Requires you run `dbt-bigquery compile` before executing.
+    executable: dbt_dry_run_invoker
+    ``` which will allow you to run the plugin at the specified target profile.
+
+
+  Once this is done, simply run `dbt-dry-run:run` and watch the magic happen!
+pip_url: git+https://github.com/potloc/dbt-dry-run-ext.git
+ext_repo: https://github.com/potloc/dbt-dry-run-ext
+repo: https://github.com/autotraderuk/dbt-dry-run
+settings:
+  - name: project-dir
+    value: ${MELTANO_PROJECT_ROOT}/transform/
+    env: DBT_PROJECT_DIR
+    description: Location of the directory hosting your `dbt_project.yml` file.
+    kind: string
+  - name: profiles-dir
+    kind: string
+    value: ${MELTANO_PROJECT_ROOT}/transform/profiles/bigquery/
+    env: DBT_PROFILES_DIR
+    description: Location of the directory hosting your `profiles.yml` file.
+  - name: target
+    kind: string
+    description: Target profile in DBT.
+variant: potloc