feat: option to skip generating `meta` and `sql`

We're using our database as the source of truth and already have raw SQL migrations that we use `goose` to manage. We're simply not in need of the `drizzle/meta` or `drizzle/0000_*.sql` direct and file. We currently have a build step to remove these afterwards, but it would be cool not to have to do that manually, and instead just tell drizzle-kit to skip those.