[BUG] [spring] [server] 5.0.1 unused imports in generated interfaces

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

Generated API interfaces contain the following unused imports, which introduce unnecessary dependencies:

• import org.springframework.data.domain.Pageable;
• import springfox.documentation.annotations.ApiIgnore;

openapi-generator version

5.0.1

OpenAPI declaration file content or url

https://raw.githubusercontent.com/openapitools/openapi-generator/master/modules/openapi-generator/src/test/resources/3_0/petstore.yaml

Generation Details

Steps to reproduce

file "springboot-options.json"

{
"basePackage":"io.swagger",
"configPackage":"io.swagger.config",
"parentGroupId":"org.springframework.boot",
"parentArtifactId":"spring-boot-starter-parent",
"parentVersion":"2.4.3",
"serverPort":9230,
"dateLibrary":"java8"
}

command line

java -jar ./openapi-generator-cli-5.0.1.jar generate -g spring -i petstore.yaml -o server\springboot\openapi -c springboot-options.json

Example: imports within generated file UserApi

package org.openapitools.api;

import java.util.List;
import org.openapitools.model.User;
import io.swagger.annotations.*;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.annotation.Validated;
import org.springframework.data.domain.Pageable;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.multipart.MultipartFile;
import springfox.documentation.annotations.ApiIgnore;

Related issues/PRs

Suggest a fix

Remove imports of springfox.documentation.annotations.ApiIgnore and data.domain.Pageable within the api interfaces, as they are not used and not needed.

Reproduce the Spring server generation with petstore.yaml, springboot-options.json, and the shown CLI command, then inspect the generator template responsible for the generated UserApi interface. Confirm that the generated interface no longer includes the two reported unused imports and that the generated output remains valid.