This pull request implements a comprehensive ZIO wrapper around the Java NATS client.

implemented NatsClient interface, which transforms the imperative Java NATS client into a fully functional interface that works seamlessly with ZIO effects. When building this wrapper, I focused on creating an intuitive API that feels natural for ZIO developers while still providing access to the full power of NATS.

For basic messaging, I’ve implemented publishing capabilities that return ZIO effects, making it simple to integrate message sending into ZIO workflows. On the receiving side, subscriptions return ZIO Streams, allowing for functional processing of message flows with all the power of ZIO Stream combinators.

Request response patterns are fully supported with both unbounded and timeout-based variants, all returning proper ZIO effects. Connection management is handled through ZIO’s scope system, ensuring that resources are properly acquired and released without developer intervention.

The configuration system is flexible and comprehensive, supporting everything from basic connection parameters to advanced TLS options. I’ve added extension methods to NATS messages to make common operations more convenient, such as getting message data as strings or sending replies.

To demonstrate usage, I’ve included a simple example application showing publish/subscribe and request/response patterns. The implementation is also backed by unit tests that verify the core functionality works as expected.

The library makes working with NATS in ZIO applications both easier and safer, eliminating common pitfalls when working with imperative Java libraries in functional Scala code.

/claim #1