[REQ] [sprind-cloud] Provide multiple response bodies

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

There should be support for several response bodies. The challenge will be that spring needs several methods for different media types.

Describe the solution you'd like

Example with different response bodies

  /foo:
    post:
      operationId: createFoo
      ...
      responses:
        '200':
          description: "Return"
          content:
                    application/octet-stream:
                      schema:
                        type: string
                        format:binary
                    text/plain:
                      schema:
                        type: string
                    application/json:
                      schema:
                         ref: "#/components/schemas/FooDto"

The generated code should contain 3 methods

@RequestMapping(produces = "application/octet-stream")
public ResponseEntity<Resource> createFoo1(...) {...}

@RequestMapping(produces = "text/plain")
public ResponseEntity<String> createFoo2(...) {...}

@RequestMapping(produces = "application/json")
public ResponseEntity<FooDto> createFoo3(...) {...}

The issue provides an OpenAPI response example with three media types and the expected Java/Spring methods; no file or test is named. Start by tracing the Spring server generator's response handling, then add coverage that verifies distinct generated methods for the three response bodies.