[BUG] [JAVA | Spring] Dates are not annotated on param model

Description

Date and datetime are correctly annotated in query params but when you use a model as query param the model date and datetime properties are not correctly annotated so it cannot recognize format.

openapi-generator version

openapi-generator-maven-plugin 4.2.2

OpenAPI declaration file content or url

openapi: 3.0.0
servers:
  - url: 'localhost:8080'
info:
  version: 1.0.0
  title: OpenAPI Zoo
  license:
    name: Apache-2.0
    url: 'https://www.apache.org/licenses/LICENSE-2.0.html'
paths:
  /zebras:
    get:
      operationId: getZebras
      parameters:
        - in: query
          name: limit
          schema:
            type: number
        - $ref: '#/components/parameters/SearchParams'
components:
  parameters:
    SearchParams:
      name: animalParams
      description: Search animal grouped parameters
      in: query
      style: form
      explode: true
      schema:
        $ref: '#/components/schemas/AnimalParams'
  schemas:
    AnimalParams:
      type: object
      properties:
        born:
          type: string
          format: date
          example: '2019-12-01'
        lastSeen:
          type: string
          format: date-time
          example: '2020-02-22T10:30:00.000'
        status:
          type: integer
          enum: [0,1]
          default: 0
        name:
          type: string
          example: 'Marty'
        age:
          type: integer
          example: 15

Command line used for generation

<configOptions>
  <dateLibrary>java8-localdatetime</dateLibrary>
</configOptions>

Steps to reproduce

Use maven plugin to generate the api, will create a model file AnimalParams.java, that file will have all parameters, included date and date-time ones, but this two parameters won't be annotated with @DateTimeFormat so it will crash when reading query parameters.

Related issues/PRs

#2053
#5389

Suggest a fix

Working on a fix to add annotations on pojo template for Spring.

Reproduce the issue with openapi-generator-maven-plugin 4.2.2 using the provided OpenAPI declaration and java8-localdatetime configuration, then inspect the generated AnimalParams.java and the Spring POJO template mentioned in the suggested fix. Done means date and date-time model properties receive the required @DateTimeFormat annotations and query parameters are parsed without crashing.