Move to new Jetstream API

[kohlisid]

Summary

There was a new package added for nats-go here https://github.com/nats-io/nats.go/releases/tag/v1.26.0

JetStream Simplified API:

This new API overhauls whole nats.go JetStream API and will eventually deprecate the legacy JetStream client implementation. For details, visit README.md in jetstream directory (https://github.com/nats-io/nats.go/blob/main/jetstream/README.md) (#1273).

• We need to gain more understanding on what all areas have changed.
• Change our current code implementation to move to this new API.
• Perform well rounded testing to ensure no regressions.
• Cut over if everything is green

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