feat(nats): adding nats clients

[Jacobbrewer1]

Describe your changes

This pull request adds support for NATS and JetStream to the application. The changes include new dependencies, initialization options, and methods to interact with NATS and JetStream.

Integration with NATS and JetStream:

• Added nats.go and jetstream dependencies to go.mod and imported them in app.go and options.go. [1] [2]
• Introduced new fields natsClient and natsStream in the App struct to manage NATS connection and JetStream stream.
• Added WithNatsClient, WithInClusterNatsClient, and WithNatsJetStream start options to initialize NATS and JetStream.
• Implemented methods to access NATS and JetStream (NatsClient, NatsJetStream, CreateNatsJetStreamConsumer).

Additional Methods for App Struct:

• Added several new methods to the App struct for better encapsulation and access to internal components (Logger, VaultClient, Viper, DBConn, KubeClient, Done, IsLeader, LeaderChange, StartServer, RedisPool, WorkerPool). [1] [2]

These changes enhance the application's capabilities by integrating with NATS and JetStream, providing more flexible initialization options, and improving the encapsulation of internal components.

[github-actions]

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