[BUG][GO] go-server generates api-files with unused imports

Created by: feech

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?
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Description

if api does not include path-parameters files "api_***.go" includes unused imports: "encoding/json" and "github.com/go-chi/chi/v5" or "github.com/gorilla/mux" (depends on selected routed)

if you remove these unused imports generated project can be compiled

openapi-generator version

5.3.0

OpenAPI declaration file content or url

https://app.swaggerhub.com/apis/acceleratedlife/alife/1.0.0

Generation Details

java -jar ./openapi-generator-cli-5.3.0.jar generate -i acceleratedLife-1.0.0-resolved.json -g go-server -o path\

Steps to reproduce

once code generated need to populate package-name in main.go and run 'go build'

compiler will show the errors:

go\api_users.go:14:2: imported and not used: "encoding/json"
go\api_users.go:18:2: imported and not used: "github.com/go-chi/chi/v5" as chi

Related issues/PRs

Suggest a fix

change a template: https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/resources/go-server/controller-api.mustache