Support `grant` and `revoke`

[tconbeer]

Postgres: https://www.postgresql.org/docs/15/sql-grant.html Snowflake (multiple pages): https://docs.snowflake.com/en/sql-reference/sql/grant-ownership.html BQ: https://cloud.google.com/bigquery/docs/reference/standard-sql/data-control-language#grant_statement