[BUG][Nim] Nim doesn't create enums

Bug Report Checklist

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

Description

Generator does not create enums

openapi-generator version

5.3.1

OpenAPI declaration file content or url

openapi: "3.0.2"
info:
  title: Test
  version: "1.0"
servers: 
  -
    url: "https://localhost:8080"
    description: "local emulator"
paths:
  /api/doSomething:
    post:
      requestBody:
        required: true
        content: 
          application/json:
            schema:
              type: boolean
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/AnObject"

components:
  schemas:
    Status:
      type: string
      enum:
        - ok
        - bad

    AnObject:
      type: object
      required: [a]
      properties:
        a:
          $ref: "#/components/schemas/Status"

Generation Details

(Using npm package openapi-generator-cli -- npm i -g @openapitools/openapi-generator-cli) openapi-generator-cli generate -g nim -i test.yml -o generated/test

Steps to reproduce

Create a file named test.yml with the yaml content above
Run the generator

Related issues/PRs

None

Suggest a fix

Instead of this

type Status* = object
  ##

generate:

type Status* = enum
  ## 
  ok, bad

@hokamoto

OpenAPITools / openapi-generator

[BUG][Nim] Nim doesn't create enums #13960