User & dataset access in GBQ

[gavh3]

AC

• Reader-Writer-Owner roles understood in the GBQ context -- User & Dataset level

[gavh3]

Inviting new BQ project contributors:

• make sure we add them to the project with the role BigQuery Data Analyst
• grant the user role roles/bigquery.dataViwer to the analytics datasets as follows:

  GRANT `roles/bigquery.dataViewer`
  ON 
  SCHEMA `nhl-breakouts.analytics_intermediate`
  TO 'user:user.email@gmail.com';