net/natscli: add new port

This port is a command line utility to interact with and manage NATS
(net/nats-server).

Features:

  * JetStream management
  * JetStream data and configuration backup
  * Message publish and subscribe
  * Service requests and creation
  * Benchmarking and Latency testing
  * Super Cluster observation
  * Configuration context maintenance
  * NATS ecosystem schema registry