[Feature Request] Add authentication options for the repository configuration of the openapitools.json

Currently it is possible to specify downloadUrl and queryUrl in the repository configuration block if a private repository should be used:

{
    "$schema": "./node_modules/@openapitools/openapi-generator-cli/config.schema.json",
    "spaces": 2,
    "generator-cli": {
        "version": "5.1.1",
        "storageDir": "./openapitools-download",
        "repository": {
            "queryUrl": "https://artifactory.mycorp.com/maven-central/select?q=g:${group.id}+AND+a:${artifact.id}&core=gav&start=0&rows=200",
            "downloadUrl": "https://artifactory.mycorp.com/maven-central/${groupId}/${artifactId}/${versionName}/${artifactId}-${versionName}.jar"
        }
    }
}

Unfortunately the artifact-storage of my organization requires login credentials and I can thus not use this option. It would be great if something like this could be added:

{
    "generator-cli": {
        "repository": {
            "queryUrl": "https://artifactory.mycorp.com/maven-central/select?q=g:${group.id}+AND+a:${artifact.id}&core=gav&start=0&rows=200",
            "downloadUrl": "https://artifactory.mycorp.com/maven-central/${groupId}/${artifactId}/${versionName}/${artifactId}-${versionName}.jar",
            "username":"",
            "password":"",
        }
    }
}

On a general note:
I think the documentation of these configuration options could be more extensive. I learned about the repository block via a comment on an issue as it is not in the README...

Commencez par apps/generator-cli/src/README.md et apps/generator-cli/src/config.schema.json afin de comprendre les options du dépôt documentées et validées. Suivez la gestion de la configuration du dépôt depuis les points d’entrée des packages, puis définissez comment fournir les identifiants de manière sûre, prenez en charge les requêtes authentifiées de consultation et de téléchargement, et documentez la configuration et l’utilisation lorsque les deux opérations fonctionnent avec un dépôt privé.