[BUG][typescript-axios] Generation failed when using enum with date or date-time

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 generation failed with errors like Exception: java.util.Date cannot be cast to java.lang.String, when the spec file contains enum with date or date-time.

openapi-generator version

5.0.0-beta2

OpenAPI declaration file content or url

---
openapi: 3.0.0
info:
  title: Test API
  description: Test API
  license:
    name: Apache 2.0
    url: http://www.apache.org/licenses/LICENSE-2.0.html
  version: 1.0.0
tags:
- name: someTag
  description: Some test tag
paths:
  "/entities":
    get:
      tags:
      - someTag
      summary: Get entities
      description: Get all entities
      operationId: getAllEntities
      parameters:
      - name: enumParameter
        in: query
        description: A parameter of type enum with date
        required: false
        schema:
          type: string
          format: date
          enum:
          - '1999-12-12'
          - '2000-11-11'
      responses:
        '200':
          description: entities
          content:
            application/json:
              schema:
                type: number

Generation Details

npx openapi-generator-cli generate --input-spec /input-dir/open-api.json --generator-name typescript-axios --output /output-dir/openapi --template-dir /template-dir/templates --api-package api --model-package model --additional-properties withSeparateModelsAndApi=true --skip-validate-spec

Steps to reproduce

1. Generate the client by using the command and the spec file above.
2. Generation will fail with the error message shown above.

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/issues/2404

Suggest a fix

1. Check whether this feature is supported by the java version, since the related issue above is still open, I assume no.
2. If yes, the type script should also do the same.
3. If no, the open api generator can decide, whether you would like to support this or not. But in the the mean time, maybe instead of throwing an error that breaks the whole generation, you can show some warning messages.

Run the supplied OpenAPI YAML through the typescript-axios generator using the documented npx command, starting with the enum handling for date and date-time values. Compare the failure with the expected generated client behavior and review related issue #2404; done means generation completes without the reported class-cast exception.