Support range on field type

[raminqaf]

Currently, we just concentrated on range queries with topic directives on the Query type. It would be nice to support range of queries on the field type.

type Query {
    product(key: Int, timestampFrom: Int, timestampTo: Int): ProductInfo!
}

type ProductInfo {
    key: String!
    info: [Info!] @topic(name: "info-topic", keyField: "key", rangeFrom: "timestampFrom", rangeTo: "timestampTo")
}

type Info {
    key: Int
    timestamp: Int!
}