add support for nacos of spring cloud alibaba

[litongjava]

Requirement Description

serving's support for microservice registries, such as nacos. You can specify the address of the registry at runtime, and djl serving automatically registers with the microservice registry.

Advantages of doing this

• Other microservice components can now invoke djl serving's services through service discovery using the service name instead of the ip and address.
• djl-serving can be automatically scaled in k8s to accommodate high concurrency.

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