[FEATURE]: Ability to check if running on the latest migration

### Describe what you want

When my app starts, I want to show an error or warning when the database is not on the latest migration.

Currently I can only run migrate, like this:

```js
import { migrate } from 'drizzle-orm/postgres-js/migrator';
await migrate(db, { migrationsFolder });
```

And I would like to be able to do this:

```js
import { checkMigration } from 'drizzle-orm/postgres-js/migrator';
const isOnLatestDbMigration = await checkMigration(db, { migrationsFolder });
```

Thank you for creating and maintaining Drizzle. Its great!