[REQ] Add a Spring Http interface to Server/Client generator

[MelleD]

Is your feature request related to a problem? Please describe.

Spring has its own Http interface description, which will be further developed in the future to use server and client code.

As an example, the Spring Open Feign was already announced as a feature completed and was no longer developed further because Spring continues to maintain and develop its own Http interface. For this reason, a new generator would be great for this.

see https://docs.spring.io/spring-framework/reference/integration/rest-clients.html#rest-http-interface

Spring Open Feign The library spring cloud-openfeign [https://github.com/spring-cloud/spring-cloud-openfeign] is in maintenance mode. Still there are bugfixes and fixes for {color:#1f2328}vulnerability fixes but no further development.

Here is the official announcement: [https://spring.io/blog/2022/12/16/spring-cloud-2022-0-0-codename-kilburn-has-been-released]

Spring Cloud OpenFeign feature complete announcement

Since Spring now provides its own interface HTTP clients solution, starting with 2022.0.0, we're going to treat Spring Cloud OpenFeign as feature complete. This means that the Spring Cloud team will no longer be adding new features to the module. We will still fix bugs and security issues, and we will also consider and review small pull requests from the community

Thats the new way: [https://docs.spring.io/spring-framework/reference/integration/rest-clients.html#rest-http-interface]