Triple Rest Openapi Support

[oxsean]

What is the purpose of the change?

Add OpenAPI support for Triple REST protocol, enabling automatic OpenAPI documentation generation
for dubbo services. The implementation includes:

• Dynamic OpenAPI spec generation from service metadata
• Support for JSON/YAML formats
• Configurable schema naming strategy
• Document caching and merging
• Group/Version/Tag filtering
• Customizable documentation through annotations

How to testing

Automatically generates OpenAPI documentation for all Dubbo services with zero configuration:

1. Access Swagger UI:

   http://host:port/dubbo/openapi
   

2. Access OpenAPI Spec:

   http://host:port/dubbo/openapi/api-docs
   

3. Supported formats:

   • JSON (default): /dubbo/openapi/api-docs
   • YAML: /dubbo/openapi/api-docs.yaml

4. Optional filters:

   • Group: /dubbo/openapi/api-docs/{group}
   • Version: /dubbo/openapi/api-docs?version=1.0.0
   • Tags: /dubbo/openapi/api-docs?tag=user,order

Example

Start dubbo-demo/dubbo-demo-spring-boot/dubbo-demo-spring-boot-servlet
then access:

http://localhost:8082/dubbo/openapi

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