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