serializer: Add serializer<std::chrono::time_point<Clock, Duration>>
serializer: Add serializer<std::chrono::time_point<Clock, Duration>>

scylladb/scylla,duarten/scylla,scylladb/scylla,raphaelsc/scylla,kjniemi/scylla,scylladb/scylla,raphaelsc/scylla,kjniemi/scylla,raphaelsc/scylla,avikivity/scylla,duarten/scylla,kjniemi/scylla,scylladb/scylla,duarten/scylla,avikivity/scylla,avikivity/scylla