Add SECURITY_INVOKER_VIEWS option to CREATE DATABASE

Hello hackers,

Currently views are not secure by default since they bypass RLS. PostgreSQL
15 introduced the `WITH (security_invoker = true)` option for this but it's
easy to miss on every new view created.

It's also inconsistent with functions, which default to SECURITY INVOKER.

I propose adding an option: `CREATE DATABASE .. SECURITY_INVOKER_VIEWS
<bool>` (false by default to maintain backwards compat), so a database will
have newly created views as SECURITY INVOKER.

Let me know what you think.

Best regards,
Steve Chavez