Custom field names for tuples Reads/Writes

[cchantep]

Pull Request Checklist

• Have you read through the contributor guidelines?
• Have you squashed your commits?
• Have you added copyright headers to new files?
• Have you updated the documentation?
• Have you added tests for any changed functionality?

Purpose

Handle simple JSON objects as Tuple{2,3,4} with custom JSON field names without having to defined case classes.

val tuple2Reads: Reads[(String, Int)] = Reads.tuple2[String, Int]("name", "age")
val tuple2Writes: OWrites[(String, Int)] = OWrites.tuple2[String, Int]("name", "age")

val tuple2ExampleJson: JsValue = Json.obj("name" -> "Alice", "age" -> 25)
val tuple2Result: JsResult[(String, Int)] = tuple2Reads.reads(tuple2ExampleJson)
println(tuple2Result)  // JsSuccess(("Alice", 25))

val tuple2Json: JsValue = tuple2Writes.writes("Bob" -> 30)
println(tuple2Json)  // {"name":"Bob","age":30}