Add google_ads dataset (#3485)

sql/moz-fx-data-shared-prod/google_ads/dataset_metadata.yaml

@@ -0,0 +1,10 @@
+friendly_name: Google_ads
+description: |-
+  User facing views for Google Ads derived tables.
+dataset_base_acl: view
+user_facing: true
+labels: {}
+workgroup_access:
+- role: roles/bigquery.dataViewer
+  members:
+  - workgroup:mozilla-confidential