[BUG][cpp-pistache-server] Generated code for query parameters which refer to a schema in the components section/another file are not fully qualified

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

The status parameter in the following specification is an enum string. It refers to the Status schema in the components section. The generated method for get_sessions is:

virtual void get_sessions(const std::optional<Status> &status, Pistache::Http::ResponseWriter &response) = 0;

While it is expected to be:

virtual void get_sessions(const std::optional<org::openapitools::server::model::Status> &status, Pistache::Http::ResponseWriter &response) = 0;

openapi-generator version

6.4.0

OpenAPI declaration file content or url

openapi: 3.0.3
info:
  title: Foo
  version: '1.0'
paths:
  /sessions:
    get:
      operationId: get_sessions
      parameters:
        - name: status
          in: query
          schema:
            $ref: '#/components/schemas/Status'
      responses:
        '200':
          description: OK
components:
  schemas:
    Status:
      type: string
      enum:
        - running
        - terminated

Generation Details

openapi-generator generate -g cpp-pistache-server -i foo.yaml

Suggest a fix

I think the following line should be changed to prepend the namespace to the data type:

https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CppPistacheServerCodegen.java#L303

Start in modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CppPistacheServerCodegen.java around line 303, then generate the provided foo.yaml with the cpp-pistache-server generator. Verify that query parameters referencing component schemas use the fully qualified model type, including org::openapitools::server::model::Status.