universal-query: New QueriedPoint struct with extendable Score enum

[coszio]

• Introduces a QueriedPoint struct, which is equivalent to a ScoredPoint, but has a Score enum, which can be used to be the output of scroll-like requests, like when specifying order_by.
• Changes the output elements of query to be of QueriedPoint type.
• Also adds this types as external grpc types and in internal grpc service

[coszio]

Closing in favor of #4291

[timvisee]

It got closed right when I was done 🥲

[timvisee]

Option implements Ord where None is always less, so you could do this with a bit less branching:

Suggested change

	match (&self.score, &other.score) {
	(Some(a), Some(b)) => a.cmp(b),
	(None, Some(_)) => Ordering::Less,
	(Some(_), None) => Ordering::Greater,
	(None, None) => self.id.cmp(&other.id),
	}
	if self.score.is_some() || other.score.is_some() {
	self.score.cmp(&other.score)
	} else {
	self.id.cmp(&other.id)
	}

Or maybe you want this instead:

self.score.cmp(&other.score).then_with(|| self.id.cmp(&other.id))