[FEATURE]: Add findFirstOrThrow() method

### Describe what you want

I've been integrating drizzle into my codebase (replacing Prisma) and so far I've had to write hundreds of snippets like this:

```ts
const feedTopic = await db.query.feedTopic.findFirst({
where: eq(schema.feedTopic.id, input.id)
})
if (!feedTopic) throw new Error('Feed topic not found')
return feedTopic
```

To save users from (mild) carpal tunnel I suggest simply adding a `findFirstOrThrow` method (like Prisma has)

The above becomes this:
```ts
return db.query.feedTopic.findFirstOrThrow({
where: eq(schema.feedTopic.id, input.id)
})
```

Bikeshedding, but it would be a nice little DX improvement.