- Add possibility to define database custom data types

Example usage:

```typescript
const customText = customType<{ data: string }>({
	dataType() {
		return 'text';
	},
});

const usersTable = pgTable('users', {
	name: customText('name').notNull(),
});
```

For more examples please check [docs](https://github.com/drizzle-team/drizzle-orm/blob/main/docs/custom-types.lite.md)